Siberian Husky vs Australian Shepherd vs Border Collie Comparison - Dog breed selector: Chuksha or Little Blue Dog or Sheepdog? Find the right dog for you

"Find similarities and differences between Siberian Husky vs Australian Shepherd vs Border Collie" Compare Siberian Husky and Australian Shepherd. Which is better: Siberian Husky or Australian Shepherd or Border Collie?

Size and Weight Price and Availability Trainability and Intelligence Personality and Temperament Activity and Playfulness Adaptability and Independence Bite Characteristics Health and Lifespan Energy and Activity Diet and Weight Management Allergies and Grooming Good With As a Working Dog Reproducibility Recognition Show differences only

Name	Siberian Husky	Australian Shepherd	Border Collie
Origins	Russia	United States	England Scotland Wales
All Dog Breeds By Country Of Origin
Group	Sled Dogs	Pastoral / Herding Dogs	Pastoral / Herding Dogs
Popularity Rank	12	17	38
Reviews	7	7	13
User Ratings

Other Names What other names do they have?	Chuksha Husky Icee Sibe Chukcha	Little Blue Dog Aussie	Sheepdog Scotch Sheep Dog
Breed Type Which dog is purebred or crossbreed? Siberian Husky vs Australian Shepherd vs Border Collie breed type comparison:	Purebred	Purebred	Purebred

Siberian Husky vs Australian Shepherd vs Border Collie Size and Weight Comparison

Size Which is bigger, Siberian Husky or Australian Shepherd or Border Collie? Which is the smallest dog, Siberian Husky or Australian Shepherd or Border Collie?	Medium	Large	Large
Weight Which is heavier, Siberian Husky or Australian Shepherd or Australian Shepherd? Siberian Husky vs Australian Shepherd vs Border Collie weight comparison:	Male: 45–60 pounds (20–27 kg), Female: 35–50 pounds (16–23 kg)	Male: 50-65 pounds (25-29 kg), Female: 40-55 pounds (18-25 kg)	Male: 30-45 pounds (14-20 kg), Female: 27-42 pounds (12-19 kg)
Average Weight Which dog has a smaller / higher average weight?	Male: 45–60 pounds (20–27 kg), Female: 35–50 pounds (16–23 kg)	Male: 57.5 pounds (27 kg), Female: 47.5 pounds (21.5 kg)	Male: 37.5 pounds (17 kg), Female: 34.5 pounds (15.5 kg)
Height Which is taller, Siberian Husky or Australian Shepherd or Border Collie? Siberian Husky vs Australian Shepherd vs Border Collie height comparison:	Male: 21–24 inches (53–61 cm), Female: 20–22 inches (51–56 cm)	Male: 20-23 inches (52-58cm), Female: 18-21 inches (46–53 cm)	Male: 19-22 inches (48-56 cm), Female: 18-21 inches (46-53 cm)
Average Height Which dog has a smaller / higher average height?	Male: 21–24 inches (53–61 cm), Female: 20–22 inches (51–56 cm)	Male: 21.5 inches (55 cm), Female: 19.5 inches (46–53 cm)	Male: 20.5 inches (52 cm), Female: 19.5 inches (49.5 cm)

Siberian Husky vs Australian Shepherd vs Border Collie Price and Availability Comparison

Price Which is cheaper, Siberian Husky or Australian Shepherd or Border Collie? Which is more expensive?	$700-$1200	$600-$800	$600-$800
Availability Which is easier to get, Siberian Husky or Australian Shepherd or Border Collie?	Very frequent: The Siberian Husky is quite easy to get.	Very frequent: The Australian Shepherd is quite easy to get.	Very frequent: The Border Collie is quite easy to get.

Siberian Husky vs Australian Shepherd vs Border Collie Trainability and Intelligence Comparison

Intelligent Rank Which is the smarter dog? Which is best? Siberian Husky vs Australian Shepherd vs Border Collie intelligence:	Average: It takes patience to teach this breed any tricks or commands, but the effort is worth it. See more.	Smart: The Australian Shepherd dogs have great intelligence. See more.	Outstanding: Border Collie is one of the brightest dog breeds. See more.
Smartest Dog Breeds
Trainability Siberian Husky vs Australian Shepherd vs Border Collie trainability comparison.	Siberian Husky dogs are hard to train. See more.	Australian Shepherd dogs are very easy to train. See more.	Border Collie dogs are easy to train. See more.
Least Obedient Dog Breeds		Dog Breeds That Easy To Train
Watchdog Ability Which is the better watchdog: Siberian Husky or Australian Shepherd or Border Collie?	Siberian Husky dogs are not the best choice if you want a good watchdog. See more.	Australian Shepherd dogs are one of the best watchdogs. See more.	Border Collie dogs are one of the best watchdogs. See more.
Guarding Behavior / Territorial Which is a better guard dog Siberian Husky or Australian Shepherd or Border Collie? Which dog is most likely to protect its owner? Which is the best dog to use for protection?	Siberian Husky dogs can't provide protection for their territory. See more.	Australian Shepherd dogs are extremely protective guard dogs. See more.	Border Collie dogs are extremely protective guard dogs. See more.
Guard Dog Breeds List

Siberian Husky vs Australian Shepherd vs Border Collie Personality and Temperament Comparison

Temperament Which one has a better personality? Which is a better family dog, Siberian Husky or Australian Shepherd or Border Collie? Siberian Husky vs Australian Shepherd vs Border Collie behavior/temperament comparison:	Alert Intelligent Friendly Outgoing Gentle	Active Loving Protective Intelligent Friendly Affectionate Good-natured	Energetic Protective Alert Intelligent Responsive Loyal Tenacious
Sensitivity Level Which dog is more sensitive? What's the difference?	They are a little bit more sensitive than other dog breeds. See more.	Sensitive: Australian Shepherd dogs don't like an irregular daily routine, noisy household, and frequent guest visits. See more.	Sensitive: Border Collie dogs don't like an irregular daily routine, noisy household, and frequent guest visits. See more.
Most Sensitive Dog Breeds		Less Sensitive Dog Breeds
Affection Level Which is the more affectionate dog breed: Siberian Husky vs Australian Shepherd vs Border Collie?	High: Siberian Husky dogs are genuinely loyal, soft and gentle, loving, and affectionate dogs toward their handlers. See more.	Average to High: Australian Shepherd dogs are highly affectionate dogs. See more.	High: Border Collie dogs are genuinely loyal, soft and gentle, loving, and affectionate dogs toward their handlers. See more.
Most Affectionate Dog Breeds
Social Needs Siberian Husky vs Australian Shepherd vs Border Collie social needs comparison:	Siberian Husky dogs need for social interaction is average. See more.	Australian Shepherd dogs are a social breed. See more.	Border Collie dogs need a lot of social interaction. See more.
Impulse to Wander or Roam Which dog has a greater roaming instinct?	Siberian Husky dogs have high wanderlust potential, which means that this breed has a strong desire for exploring the world. See more.	Australian Shepherd dogs are not the biggest explorers. See more.	Border Collie dogs have average wanderlust potential. See more.
Prey Drive Which dog has a higher prey drive? Which can be better for hunting?	Siberian Husky dogs have an average prey drive, which means that they don't have a high impulse to chase and catch something like a cat or any other small aminals, but it might happen. See more.	Australian Shepherd dogs have a higher impulse to chase and catch something than other dog breeds. See more.	Border Collie dogs have an average prey drive, which means that they don't have a high impulse to chase and catch something like a cat or any other small aminals, but it might happen. See more.
Dog Breeds With Low Prey Drive		Dog Breeds With High Prey Drive

Siberian Husky vs Australian Shepherd vs Border Collie Activity and Playfulness Comparison

Playfulness Siberian Husky vs Australian Shepherd vs Border Collie playfulness comparison:	The Siberian Husky is a playful breed. See more.	The Australian Shepherd is a highly playful breed. See more.	The Border Collie is a highly playful breed. See more.
Most Playful Dog Breeds
Barking Which dog barks more/less: Siberian Husky vs Australian Shepherd vs Border Collie?	Average: The Siberian Husky barks occasionally. See more.	Low to Average: The Australian Shepherd rarely barks. See more.	Low to Average: The Border Collie rarely barks. See more.
Quiet Dog Breeds That Don't Bark		Dog Breeds That Bark The Most
Apartment Friendly Which dog is more apartment friendly Siberian Husky or Australian Shepherd or Border Collie?	It is not recommended to keep the Siberian Husky breed in the home.	It is not the best choice if you want to keep them indoors, however, with careful exercise and several walks a day, they will tolerate the indoor environment, so it is possible to keep Australian Shepherd indoors.	It is not recommended to keep the Border Collie breed in the home.
The Worst Dog Breeds for Apartment Living		Apartment Friendly Dogs List

Siberian Husky vs Australian Shepherd vs Border Collie Adaptability and Independence Comparison

Adaptability Which dog has a higher adaptability potential? Which is the better dog?	Siberian Husky dogs adapt very well to lifestyle changes and basically all living environments.	Australian Shepherd dogs adapt very well to lifestyle changes and basically all living environments.	Border Collie dogs adapt very well to lifestyle changes and basically all living environments.
Tolerates Being Left Alone Which dog can be left alone: Siberian Husky or Australian Shepherd or Border Collie?	Just like every puppy, they are prone to panic, cry, bark, whine when they left alone by their owner.	Australian Shepherd dogs do best when a family member is at home during the day or if their workplace is dog-friendly so they can take the dog at work.	Border Collie dogs tend to have separation anxiety when their owners left them alone at home because they bond very closely with them.

Siberian Husky vs Australian Shepherd vs Border Collie Bite Characteristics Comparison

Bite Force PSI Which bite is stronger: Siberian Husky or Australian Shepherd or Border Collie?	Between 200 and 400 PSI ⏺ Siberian Husky bite force: Ordinary.	Between 200 and 400 PSI ⏺ Australian Shepherd bite force: Ordinary.	Between 200 and 400 PSI ⏺ Border Collie bite force: Ordinary.
Dog Breeds With The Lowest Bite Force		Dog Breeds With the Strongest Bite Force
Biting Potential Which breed of dog is most likely to bite? Biting potential comparison:	Low 🔽 The Siberian Husky has a low chance of biting somebody.	Low 🔽 The Australian Shepherd has a low chance of biting somebody.	Low 🔽 The Border Collie has a low chance of biting somebody.
Mouthiness Which is the better dog? Siberian Husky vs Australian Shepherd vs Border Collie mouthiness comparison:	Siberian Husky dogs have a higher than average tendency to nip, chew, playbite, or herd people. See more.	Australian Shepherd dogs have a higher than average tendency to nip, chew, playbite, or herd people. See more.	Border Collie dogs have a strong tendency to nip, chew, play-bite, or herd people. See more.

Siberian Husky vs Australian Shepherd vs Border Collie Health and Lifespan Comparison

Health Issues Siberian Husky vs Australian Shepherd vs Border Collie health comparison. Which is the healthier: Siberian Husky vs Australian Shepherd vs Border Collie?	The Siberian Husky is a healthy breed, but there are certain health issues that you should check with your vet regularly.	The Australian Shepherd is a healthy breed, but there are certain health issues that you should check with your vet regularly.	The Border Collie is a healthy breed, but there are certain health issues that you should check with your vet regularly.
Healthiest Dog Breeds
Health Problems Which one has more or less genetic/health problems: Siberian Husky vs Australian Shepherd vs Border Collie? What are the allergies, genetic diseases and concerns for them? Siberian Husky vs Australian Shepherd vs Border Collie health problems comparison:	Cataracts Progressive retinal atrophy (PRA) Corneal Dystrophy	Cataracts Hip Dysplasia Allergies Cancer Hypothyroidism Progressive retinal atrophy (PRA) Epilepsy Deafness Drug Sensitivity Elbow Dysplasia Distichiasis Collie Eye Anomaly Detached Retina Nasal Solar Dermatitis Osteochondrosis Dissecans Persistent Pupillary Membranes	Hip Dysplasia Allergies Progressive retinal atrophy (PRA) Epilepsy Collie Eye Anomaly Osteochondrosis Dissecans
Veterinarian Visits Which one may need more or less veterinary visits?	Average The Siberian Husky should have a complete physical check-up at least once per year.	Average The Australian Shepherd should have a complete physical check-up at least once per year.	Average The Border Collie should have a complete physical check-up at least once per year.
Longest Living Dog Breeds
Life Expectancy Siberian Husky vs Australian Shepherd vs Border Collie lifespan comparison. How long do Siberian Husky, Australian Shepherd and Border Collie breeds live? Which one has a longer lifespan/life expectancy?	12-14 years The average lifespan of Siberian Husky: 13 years	11-15 years The average lifespan of Australian Shepherd: 13 years	11-15 years The average lifespan of Border Collie: 13 years
Calculate dog years to human years by breed here
Weather and Climate Which dog is best for hot or cold weather: Siberian Husky vs Australian Shepherd vs Border Collie?	Prefers cold weather The Siberian Husky can adapt well to harsh weather conditions, and also can be a good mountain dog. See more.	Prefers average to cold weather conditions The Australian Shepherd can adapt to well to cold weather conditions, some dogs even can be a good mountain dog. See more.	Prefers average to cold weather conditions The Border Collie can adapt to well to cold weather conditions, some dogs even can be a good mountain dog. See more.

Siberian Husky vs Australian Shepherd vs Border Collie Energy and Activity Comparison

Energy Level Who has more energy a Siberian Husky or Australian Shepherd or Border Collie? Siberian Husky vs Australian Shepherd vs Border Collie energy level comparison:	Siberian Husky dogs are high-energy dogs.	Australian Shepherd dogs are high-energy dogs.	Border Collie dogs are high-energy dogs.
Low-Energy Dog Breeds		High-Energy Dog Breeds
Activity Requirement / Exercise Need Siberian Husky vs Australian Shepherd vs Border Collie exercise need comparison. Which dog needs more activity? Which dog needs the most exercise: Siberian Husky or Australian Shepherd or Border Collie? Which dog needs the most walking? Which dog is the laziest?	Siberian Husky dogs need quite a lot of exercise.	Australian Shepherd dogs need a lot of exercises.	Border Collie dogs need a lot of exercises.
Sleeping Need Which one sleeps the least/most: Siberian Husky or Australian Shepherd or Border Collie?	Siberian Husky dogs don't need too much sleep.	Australian Shepherd dogs don't need too much sleep.	Border Collie dogs don't need too much sleep.
Dog Breeds That Sleep A Lot

Siberian Husky vs Australian Shepherd vs Border Collie Diet and Weight Management Comparison

Average daily food consumption Which dog eats more: Siberian Husky or Australian Shepherd or Border Collie?	Recommended daily amount: 2.5 to 3 cups of high-quality dry food a day, divided into two meals.	1.5 to 2.5 cups of high-quality dry food a day, divided into two meals.	1.5 to 2 cups of high-quality dry food a day, divided into two or three meals.
Dog Breeds That Eat A Lot
Weight Gain Potential / Prone to Obesity Which dog breed is more prone to obesity? Siberian Husky vs Australian Shepherd vs Border Collie weight gain potential comparison:	Low to Average: The Siberian Husky has a low to the average risk for obesity. See more.	Average to High: If you don't pay attention to the Australian Shepherd's weight, he can easily gain weight. See more.	Average: The Border Collie has an average risk for obesity. See more.
Dog Breeds Prone To Obesity

Siberian Husky vs Australian Shepherd vs Border Collie Allergies and Grooming Comparison

Coat / Hair Types What type of coat/fur do they have? Siberian Husky vs Australian Shepherd vs Border Collie coat comparison:	Fluffy	Feathered	Dense Feathered Straight Short Moderately Long
Colors What are the original Siberian Husky, Australian Shepherd and Border Collie color?	Black Gray Red White Sable Agouti	Black Red Blue Merle	Black Tan Red Sable Brindle Lilac Gold Seal White & Red Slate Sable Merle Black & White Tricolor Blue merle Blue merle-tricolor Slate merle Red merle Saddleback Sable White & Blue White & Blue Merle White & Red Merle White Ticked White & Gold White & Sable White & Seal
Grooming Which dog is easy to maintain, Siberian Husky or Australian Shepherd or Border Collie? Siberian Husky vs Australian Shepherd vs Border Collie grooming comparison:	Average: The Siberian Husky requires average grooming effort. See more.	Average: The Australian Shepherd requires average grooming effort. See more.	Average: The Border Collie requires average grooming effort. See more.
Low-Maintenance Dog Breeds		High-Maintenance Dog Breeds
Shedding Level Who sheds more Siberian Husky or Australian Shepherd or Border Collie? Siberian Husky or Australian Shepherd or {name3 shedding:	Siberian Husky dogs shed above average. See more.	Australian Shepherd dogs shed moderately. See more.	Border Collie dogs shed moderately. See more.
Low-Shedding Dog Breeds		Dog Breeds That Shed The Most
Bath Time / Bathing Frequency Which dog should be bathed more: Siberian Husky or Australian Shepherd or Border Collie?	3-4 weeks More often than average. These dog coats tend to be longer, softer, and oilier than short-haired breeds. See more.	6-8 weeks Rarely. Bathing your dog is beneficial to them in more ways than just one. See more.	6-8 weeks Rarely. Bathing your dog is beneficial to them in more ways than just one. See more.
Hypoallergenic Siberian Husky vs Australian Shepherd vs Border Collie hypoallergenic comparison. Which dog is hypoallergenic or not?	No See more.	No See more.	No See more.
Hypoallergenic Dog Breeds
Stinkiness Which dog breed smells the least? Which dog smells the most? Which is best, Siberian Husky vs Australian Shepherd vs Border Collie?	Low 🔽 The Siberian Husky has a low chance of bad smell.	Medium ⏺ The Australian Shepherd has an average chance of bad smell.	Medium ⏺ The Border Collie has an average chance of bad smell.
Drooling Tendency Which dog drools the most? Which dog drools the least?	The Siberian Husky is an average drooler. See more.	The Australian Shepherd is a perfect example of a very low drooling tendency. See more.	The Border Collie is a perfect example of a very low drooling tendency. See more.

Siberian Husky vs Australian Shepherd vs Border Collie Good With Comparison

Pet Friendly Which dog breeds get along well with other animals/pets?	Siberian Husky dogs do best when they’re the only pet at the family.	Australian Shepherd dogs are generally with other pets.	Border Collie dogs are generally with other pets.
Stranger Friendly Which dog is more stranger friendly Siberian Husky or Australian Shepherd or Border Collie? Which dog is more friendly?	Siberian Husky dogs are average friendly towards strangers.	Australian Shepherd dogs are not the most stranger-friendly dogs.	Border Collie dogs are average friendly towards strangers.
Dog Breeds That Are Aloof With Strangers		Dog Breeds That Are Friendly To Strangers
Child Friendly Which dog is more child/kid friendly Siberian Husky or Australian Shepherd or Border Collie?	Siberian Husky dogs are kid-friendly dogs.	Australian Shepherd dogs are very kid-friendly dogs.	Border Collie dogs are very kid-friendly dogs.
Kid-Friendly Dog Breeds
Cat Friendly Which dog is more cat friendly Siberian Husky or Australian Shepherd or Border Collie?	Siberian Husky dogs are not cat-friendly dogs.	Australian Shepherd dogs are average friendly towards cats.	Border Collie dogs are average friendly towards cats.
Dog Breeds That Get Along Well With Cats
Dog Friendly Which dog is more dog friendly Siberian Husky or Australian Shepherd or Border Collie?	Siberian Husky dogs are very dog-friendly dogs.	Australian Shepherd dogs are average friendly towards other dogs.	Border Collie dogs are average friendly towards other dogs.
Good For First Time Owners Which dog is good for the first-time owners: Siberian Husky vs Australian Shepherd vs Border Collie?	No Siberian Husky dogs are not good for novice owners, due to their stubborn personality.	Yes Australian Shepherd dogs are good for novice owners, due to their easy-going personality.	Yes Border Collie dogs are good for novice owners, due to their easy-going personality.
Office Friendly Which one fits better in the office?	No Siberian Husky is not the best dog breed for office environment.	No Australian Shepherd is not the best dog breed for office environment.	No Border Collie is not the best dog breed for office environment.
Senior Citizens Friendly Which dog is good for elderly people?	Siberian Huskys are usually recommended for elderly people.	Australian Shepherds are one of the best breeds for elderly people.	Border Collies are one of the best breeds for elderly people.

Siberian Husky vs Australian Shepherd vs Border Collie As a Working Dog Comparison

Service Dog Which one could be a service dog?	Not really This breed generally not used as a service dog. See more.	Not really This breed generally not used as a service dog. See more.	Yes This breed makes good as a service dog. See more.
Most Popular Service Dog Breeds
Therapy Dog Which one could be a therapy dog: Siberian Husky or Australian Shepherd or Border Collie? Which is better for autism?	Not really This breed is generally not used as a therapy dog. See more.	Not really This breed is generally not used as a therapy dog. See more.	Yes This breed makes a perfect therapy dog. See more.
Therapy Dog Breeds
Detection Dog or Sniffer Dog Which one could be a detection/sniffer dog?	Not really They are not typically employed for this type of work, but there may be exceptional cases.	Not really They are not typically employed for this type of work, but there may be exceptional cases.	Yes After proper training, they can excel at this kind of work.
Search and Rescue Dog (SAR) Which one could be a search and rescue dog?	Not really This dog breed is not typically used as a search and rescue dog.	Not really This dog breed is not typically used as a search and rescue dog.	Yes This breed would make an excellent search and rescue dog.
Boat and Sailor Dog Which one could be a boat dog: Siberian Husky vs Australian Shepherd vs Border Collie?	Not really Siberian Husky breed usually doesn't like being on a boat. See more.	Not really Australian Shepherd breed usually doesn't like being on a boat. See more.	Not really Border Collie breed usually doesn't like being on a boat. See more.
Cart Pulling or Drafting Dog Which one could be a cart pulling or drafting dog?	Not really A drafting dog or draft dog is a dog bred and used for cart pulling. See more.	Not really A drafting dog or draft dog is a dog bred and used for cart pulling. See more.	Not really A drafting dog or draft dog is a dog bred and used for cart pulling. See more.
Fighting Dog / Military Dog	Yes In history, this breed was unfortunately used for combat dogs.	Not really In history, this breed was not really used for combat dog.	Not really In history, this breed was not really used for combat dog.

Siberian Husky vs Australian Shepherd vs Border Collie Reproducibility Comparison

Gestation Length	60-64 days See more.	60-64 days See more.	60-64 days See more.
Litter Frequency	Once a year. More frequent breeding is not healthy. See more.	Once a year. More frequent breeding is not healthy. See more.	Once a year. More frequent breeding is not healthy. See more.
Litter Size How many puppies can Siberian Husky and Australian Shepherd and Border Collie have?	4-8 puppies	6-9 puppies, average 7	4-8 puppies
Dog Name Generator – Find A Perfect Name For Your Puppy

Siberian Husky vs Australian Shepherd vs Border Collie Recognition Comparison

AKC Group Which dog is recognized by the AKC?	Recognized by the American Kennel Club in 1930 as a Working breed.	Recognized by the American Kennel Club in 1991 as a Herding breed.	Recognized by the American Kennel Club in 1995 as a Herding breed.
FCI Group Which dog is recognized by the FCI?	Recognized by FCI in the Spitz and primitive types group, in the Nordic Sledge Dogs section.	Recognized by FCI in the Sheepdogs and Cattledogs (except Swiss Cattledogs) group, in the Sheepdogs section.	Recognized by FCI in the Sheepdogs and Cattledogs (except Swiss Cattledogs) group, in the Sheepdogs section.
Breed Recognition What other organizations and kennel clubs recognize these dog breeds?	American Canine Registry American Kennel Club America's Pet Registry Canadian Kennel Club Dog Registry of America Inc. Federation Cynologique Internationale Kennel Club of Great Britain North American Purebred Registry, Inc. American Canine Association, Inc. Australian National Kennel Council Continental Kennel Club National Kennel Club New Zealand Kennel Club United Kennel Club	American Canine Registry American Kennel Club America's Pet Registry Dog Registry of America Inc. North American Purebred Registry, Inc. American Canine Association, Inc. Continental Kennel Club National Kennel Club New Zealand Kennel Club United Kennel Club Australian Shepherd Club Of America	American Canine Registry American Kennel Club America's Pet Registry Dog Registry of America Inc. Federation Cynologique Internationale Kennel Club of Great Britain North American Purebred Registry, Inc. American Canine Association, Inc. Australian National Kennel Council Continental Kennel Club National Kennel Club New Zealand Kennel Club United Kennel Club The American Int. Border Collie Registry The American Border Collie Association

Popular Dog Compares

Despite the best intentions, there may be errors. If you find one, please let us know and we will fix it as soon as possible. Contact us here.

Rate This Comparsion - Siberian Husky vs Australian Shepherd vs Border Collie

Reviews

Eloise
Aug 20, 2019, 9:04:41 AM:
I really liked this, and it helped me a lot.