Dog Collar & Harness Sizing
Find the right collar or harness size by breed or by measurement — anchored to neck and chest circumference, with the two-finger safety rule built in. Measure your dog; breed is only a starting point.
Collar & Harness Calculator
Enter neck or chest size, get the right fit instantly.
Open calculator → CatsCat Collar Sizing
Breakaway-safe cat collars by breed and measurement.
Browse cats →22 cm Dog Neck
A 22 cm neck suits a XS collar.
View guide →24 cm Dog Neck
A 24 cm neck suits a XS collar.
View guide →26 cm Dog Neck
A 26 cm neck suits a XS collar.
View guide →28 cm Dog Neck
A 28 cm neck suits a S collar.
View guide →30 cm Dog Neck
A 30 cm neck suits a S collar.
View guide →32 cm Dog Neck
A 32 cm neck suits a S collar.
View guide →34 cm Dog Neck
A 34 cm neck suits a S collar.
View guide →36 cm Dog Neck
A 36 cm neck suits a M collar.
View guide →38 cm Dog Neck
A 38 cm neck suits a M collar.
View guide →40 cm Dog Neck
A 40 cm neck suits a M collar.
View guide →42 cm Dog Neck
A 42 cm neck suits a M collar.
View guide →44 cm Dog Neck
A 44 cm neck suits a M collar.
View guide →46 cm Dog Neck
A 46 cm neck suits a L collar.
View guide →48 cm Dog Neck
A 48 cm neck suits a L collar.
View guide →50 cm Dog Neck
A 50 cm neck suits a L collar.
View guide →52 cm Dog Neck
A 52 cm neck suits a L collar.
View guide →54 cm Dog Neck
A 54 cm neck suits a L collar.
View guide →56 cm Dog Neck
A 56 cm neck suits a XL collar.
View guide →58 cm Dog Neck
A 58 cm neck suits a XL collar.
View guide →60 cm Dog Neck
A 60 cm neck suits a XL collar.
View guide →62 cm Dog Neck
A 62 cm neck suits a XL collar.
View guide →64 cm Dog Neck
A 64 cm neck suits a XL collar.
View guide →66 cm Dog Neck
A 66 cm neck suits a XXL collar.
View guide →68 cm Dog Neck
A 68 cm neck suits a XXL collar.
View guide →Affenpinscher
Collar XS · harness XS (neck 23–30 cm).
View guide →Airedale Terrier
Collar M · harness M (neck 41–48 cm).
View guide →Akita
Collar L · harness XL (neck 48–61 cm).
View guide →Alaskan Malamute
Collar L · harness XL (neck 46–56 cm).
View guide →American Pit Bull Terrier
Collar L · harness M (neck 41–51 cm).
View guide →Anatolian Shepherd
Collar XL · harness XL (neck 56–71 cm).
View guide →Australian Cattle Dog
Collar M · harness M (neck 36–46 cm).
View guide →Australian Shepherd
Collar M · harness M (neck 38–46 cm).
View guide →Basset Hound
Collar M · harness M (neck 38–48 cm).
View guide →Beagle
Collar M · harness M (neck 33–41 cm).
View guide →Bedlington Terrier
Collar S · harness S (neck 30–38 cm).
View guide →Belgian Malinois
Collar L · harness L (neck 41–51 cm).
View guide →Bernese Mountain Dog
Collar XL · harness XL (neck 51–66 cm).
View guide →Bichon Bolognese
Collar XS · harness XS (neck 23–30 cm).
View guide →Bichon Frise
Collar S · harness S (neck 25–33 cm).
View guide →Bloodhound
Collar XL · harness XL (neck 51–61 cm).
View guide →Border Collie
Collar M · harness M (neck 33–43 cm).
View guide →Border Terrier
Collar S · harness S (neck 28–36 cm).
View guide →Borzoi
Collar L · harness L (neck 41–51 cm).
View guide →Boston Terrier
Collar S · harness S (neck 30–40 cm).
View guide →Boxer
Collar L · harness L (neck 41–51 cm).
View guide →Brittany
Collar M · harness M (neck 33–41 cm).
View guide →Brussels Griffon
Collar XS · harness XS (neck 23–30 cm).
View guide →Bull Terrier
Collar L · harness M (neck 41–51 cm).
View guide →Bulldog
Collar L · harness M (neck 40–51 cm).
View guide →Bullmastiff
Collar XL · harness XL (neck 51–66 cm).
View guide →Cairn Terrier
Collar S · harness S (neck 28–36 cm).
View guide →Cane Corso
Collar XL · harness XL (neck 51–66 cm).
View guide →Cardigan Welsh Corgi
Collar M · harness M (neck 33–43 cm).
View guide →Cavalier King Charles Spaniel
Collar S · harness S (neck 25–33 cm).
View guide →Chesapeake Bay Retriever
Collar L · harness L (neck 43–51 cm).
View guide →Chihuahua
Collar XS · harness XS (neck 20–28 cm).
View guide →Chinese Crested
Collar XS · harness XS (neck 23–30 cm).
View guide →Chow Chow
Collar L · harness L (neck 41–51 cm).
View guide →Cockapoo
Collar S · harness S (neck 28–38 cm).
View guide →Cocker Spaniel
Collar S · harness M (neck 30–40 cm).
View guide →Collie
Collar M · harness M (neck 38–48 cm).
View guide →Coton de Tulear
Collar S · harness S (neck 25–33 cm).
View guide →Dachshund
Collar S · harness S (neck 28–38 cm).
View guide →Dalmatian
Collar M · harness M (neck 38–48 cm).
View guide →Doberman Pinscher
Collar L · harness L (neck 41–56 cm).
View guide →English Bulldog
Collar L · harness M (neck 41–53 cm).
View guide →English Setter
Collar M · harness M (neck 38–46 cm).
View guide →English Springer Spaniel
Collar M · harness M (neck 36–43 cm).
View guide →Field Spaniel
Collar M · harness M (neck 33–41 cm).
View guide →Finnish Spitz
Collar M · harness M (neck 33–43 cm).
View guide →Flat-Coated Retriever
Collar M · harness L (neck 41–48 cm).
View guide →Fox Terrier
Collar S · harness S (neck 30–38 cm).
View guide →French Bulldog
Collar M · harness M (neck 33–43 cm).
View guide →German Shepherd
Collar L · harness L (neck 41–56 cm).
View guide →German Shorthaired Pointer
Collar M · harness M (neck 41–48 cm).
View guide →Golden Retriever
Collar L · harness L (neck 41–51 cm).
View guide →Goldendoodle
Collar M · harness M (neck 38–48 cm).
View guide →Great Dane
Collar XL · harness XL (neck 51–66 cm).
View guide →Great Pyrenees
Collar XL · harness XL (neck 51–66 cm).
View guide →Great Swiss Mountain Dog
Collar XL · harness XL (neck 51–64 cm).
View guide →Greyhound
Collar M · harness L (neck 33–41 cm).
View guide →Havana Silk Dog
Collar XS · harness XS (neck 23–30 cm).
View guide →Havanese
Collar XS · harness XS (neck 23–30 cm).
View guide →Irish Setter
Collar M · harness M (neck 38–46 cm).
View guide →Irish Terrier
Collar M · harness M (neck 33–41 cm).
View guide →Irish Wolfhound
Collar XL · harness XL (neck 51–66 cm).
View guide →Italian Greyhound
Collar XS · harness XS (neck 20–28 cm).
View guide →Jack Russell Terrier
Collar S · harness S (neck 28–36 cm).
View guide →Japanese Chin
Collar XS · harness XS (neck 23–30 cm).
View guide →Keeshond
Collar M · harness M (neck 36–46 cm).
View guide →Kerry Blue Terrier
Collar M · harness M (neck 36–43 cm).
View guide →Labrador Retriever
Collar L · harness L (neck 41–51 cm).
View guide →Lagotto Romagnolo
Collar M · harness M (neck 33–41 cm).
View guide →Leonberger
Collar XL · harness XL (neck 56–71 cm).
View guide →Lhasa Apso
Collar S · harness S (neck 28–36 cm).
View guide →Lowchen
Collar S · harness S (neck 25–33 cm).
View guide →Maltese
Collar XS · harness XS (neck 18–25 cm).
View guide →Manchester Terrier
Collar S · harness S (neck 28–36 cm).
View guide →Mastiff
Collar XXL · harness XXL (neck 56–76 cm).
View guide →Miniature Pinscher
Collar XS · harness XS (neck 23–30 cm).
View guide →Miniature Schnauzer
Collar S · harness S (neck 28–38 cm).
View guide →Newfoundland
Collar XL · harness XL (neck 56–71 cm).
View guide →Norfolk Terrier
Collar S · harness XS (neck 25–33 cm).
View guide →Norwich Terrier
Collar S · harness XS (neck 25–33 cm).
View guide →Nova Scotia Duck Tolling Retriever
Collar M · harness M (neck 36–43 cm).
View guide →Old English Sheepdog
Collar L · harness XL (neck 46–56 cm).
View guide →Papillon
Collar XS · harness XS (neck 20–28 cm).
View guide →Pekingese
Collar S · harness S (neck 28–36 cm).
View guide →Pembroke Welsh Corgi
Collar M · harness M (neck 33–43 cm).
View guide →Pharaoh Hound
Collar M · harness M (neck 36–43 cm).
View guide →Plott Hound
Collar M · harness M (neck 41–48 cm).
View guide →Pointer
Collar M · harness M (neck 41–48 cm).
View guide →Pomeranian
Collar XS · harness XS (neck 23–30 cm).
View guide →Portuguese Water Dog
Collar M · harness M (neck 38–46 cm).
View guide →Pug
Collar S · harness S (neck 30–40 cm).
View guide →Rhodesian Ridgeback
Collar L · harness L (neck 46–56 cm).
View guide →Rottweiler
Collar XL · harness XL (neck 48–64 cm).
View guide →Saint Bernard
Collar XL · harness XL (neck 56–71 cm).
View guide →Samoyed
Collar M · harness M (neck 38–48 cm).
View guide →Schipperke
Collar S · harness S (neck 28–36 cm).
View guide →Scottish Terrier
Collar S · harness S (neck 30–38 cm).
View guide →Sealyham Terrier
Collar M · harness S (neck 33–41 cm).
View guide →Shar Pei
Collar L · harness M (neck 41–51 cm).
View guide →Shetland Sheepdog
Collar S · harness S (neck 30–38 cm).
View guide →Shih Tzu
Collar S · harness S (neck 28–36 cm).
View guide →Siberian Husky
Collar M · harness M (neck 36–46 cm).
View guide →Soft Coated Wheaten Terrier
Collar M · harness M (neck 36–43 cm).
View guide →Spanish Water Dog
Collar M · harness M (neck 36–43 cm).
View guide →Spinone Italiano
Collar L · harness L (neck 43–51 cm).
View guide →Staffordshire Bull Terrier
Collar M · harness M (neck 36–46 cm).
View guide →Standard Poodle
Collar M · harness M (neck 36–46 cm).
View guide →Standard Schnauzer
Collar M · harness M (neck 36–46 cm).
View guide →Sussex Spaniel
Collar M · harness M (neck 36–43 cm).
View guide →Tibetan Mastiff
Collar XL · harness XL (neck 56–71 cm).
View guide →Tibetan Terrier
Collar S · harness S (neck 30–38 cm).
View guide →Toy Poodle
Collar XS · harness XS (neck 20–28 cm).
View guide →Vizsla
Collar M · harness M (neck 36–46 cm).
View guide →Weimaraner
Collar L · harness L (neck 41–51 cm).
View guide →Welsh Terrier
Collar S · harness S (neck 30–38 cm).
View guide →West Highland White Terrier
Collar S · harness S (neck 28–36 cm).
View guide →Whippet
Collar S · harness M (neck 28–36 cm).
View guide →Wirehaired Pointing Griffon
Collar M · harness M (neck 38–46 cm).
View guide →Xoloitzcuintli
Collar M · harness M (neck 33–43 cm).
View guide →Yorkshire Terrier
Collar XS · harness XS (neck 20–28 cm).
View guide →