Breed Size Adult Classification

All dogs are classified as an Adult dog at different points in their life. The largest distinction in when this occurs depends mostly on their breed.

Use our handy list below to find an approximation for your dog's age when they are now deemed an adult dog.

TOY

Dog becomes adult at approx. 6 - 9 months

Affenpinscher
Australian Silky Terrier
Australian Terrier
Bichon Frise
Chihuahua
Chinese Crested
Dachshund (miniature)
English Toy Terrier
German Spitz (small)
Griffon
Italian Greyhound
Japanese Chin
King Charles Spaniel
Lowchen
Maltese Terrier
Norfolk Terrier
Norwich Terrier
Papillon
Phalene
Pekeingese
Pinscher (miniature)
Poodle (toy)
Pomeranian
Schipperke
Shih Tzu
Tibetan Spaniel
Yorkshire Terrier

SMALL

Dog becomes adult at approx. 9 - 12 months

American Cocker Spaniel
Basenji
Bedlington Terrier
Border Terrier
Boston Terrier
Cairn Terrier
Cavalier King Charles Spaniel
Dandie Dinmont Terrier
Fox Terrier
French Bulldog
Jack Russell Terrier
Japanese Spitz
Lakeland Terrier
Lhasa Apso
Manchester Terrier
Poodle (miniature)
Pug
Schnauzer (miniature)
Scottish Terrier
Sealyham Terrier
Shetland Sheepdog
Tibetan Terrier
Welsh Terrier
West Highland White Terrier

MEDIUM

Dog becomes adult at approx. 12 - 15 months

American Water Spaniel
Australian Kelpie/Cattle Dog
Basset Petit Griffon Vendeen
Beagle
Border Collie
Brittany Spaniel
Bull Terrier
Canaan dog
Cocker Spaniel (English)
Collie (rough/smooth/bearded)
Dachshund (standard)
Elkhound
English Springer Spaniel
Field Spaniel
Finnish Spitz
Foxhound
Glenn of Imaal Terrier
Irish Terrier
Keeshound
Kerry Blue Terrier
Norwegian Buhund
Pharaoh Hound
Pinscher
Portuguese Water Dog
Puli
Saluki
Samoyed
Schnauzer
Shar-Pei
Sheba Inu
Siberian Husky
Skye Terrier
Soft Coated Wheaten Terrier
Staffordshire Bull Terrier
Sussex Spaniel
Welsh Corgi (Pembroke/Cardigan)
Welsh Springer Spaniel
Whippet

LARGE

Dog becomes adult at approx. 15 - 20 months

Afghan Hound
Airedale
Alaskan Malamute
Basset Hound
Belgain Shepherd Dog
Bernese Mountain Dog
Borzoi
Bouvier Des Flandres
Boxer
Briard
Bulldog
Chesapeake Bay Retriever
Chow Chow
Clumber Spaniel
Curly-Coated Retriever
Dalmatian
Deerhound
Doberman
English Setter
Eskimo Dog
Estrela Mountain Dog
Flat-Coated Retriever
German Shepherd Dog
Golden Retriever
Gordon Setter
Greyhound
Hovawart
Hungarian Vizsla
Ibizan Hound
Irish Setter
Irish Water Spaniel
Italian Spinone
Japanese Akita
Labrador Retriever
Maremma Sheepdog
Munsterlander (large)
Old English Sheepdog
Otterhound
Pointer
Poodle (standard)
Schnauzer (giant)
Rhodesian Ridgeback
Rottweiler
Weimaraner

GIANT

Dog becomes adult at approx. 20 months

Anatolian Shepherd Dog
Bloodhound
Bullmastiff
Great Dane
Irish Wolfhound
Komondor
Leonberger
Mastiff
Neapolitan Mastiff
Newfoundland
Pyrenean Mountain Dog
St. Bernard

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