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Table 1 Breeds used in the study, categorized according to genetic cluster. Each group was represented by 10 dogs

From: Polymorphisms in the canine monoamine oxidase a (MAOA) gene: identification and variation among five broad dog breed groups

Genetic Cluster Breeds
Ancient Akita, Alaskan Malamute (x2), Basenji (x2), Samoyed (x2), Siberian Husky (x3)
Herding Australian Shepherd Dog, Belgian Malinois, Belgian Tervuren, Border Collie, Cardigan Welsh Corgi, Great Dane, Greyhound, Irish Wolfhound, Rough Collie, Shetland Sheepdog
Mastiff American Staffordshire Terrier, Boxer, Bulldog, English Mastiff, Labrador Retriever (x2), Newfoundland, Pembroke Welsh Corgi, Pitbull Terrier, Yorkshire Terrier
Modern European Beauceron, Catahoula, Cocker Spaniel, Dalmatian, Doberman Pinscher (x2), German Short Haired Pointer, Golden Retriever, Shih Tzu, Toy Poodle
Mountain German Shepherd (x3), Italian Greyhound, Miniature Pinscher, Rhodesian Ridgeback, Rottweiler, Standard Poodle, St. Bernard, Bernese Mountain Dog