| Summary: | For about 14 000 years ago the domestication of the wolf, Canis lupus, began. This initiated the extensive work of breeding that resulted in man´s best friend, the dog. Its Latin name, Canis lupus familiaris, clearly shows how close they stand us people today. The Swedish Kennel Club has 343 registered breeds which are very different from each other in terms of the exterior, but also behaviourally. The behavioural differences in adult dogs of different breeds are commonly known. Something that is still in dispute is when these differences begin to manifest in the dog´s life. In this study two interview investigations were conducted with the aim to see whether distinct behavioural differences between breeds could be identified in the puppy stage. The breeds that were included in the study were American Staffordshire terrier, Border collie and Whippet. Two questionnaires were designed. One was sent to breeders because they were considered to have the most experience of the breeds in question. The other questionnaire was sent to veterinarians to get a more objective picture of the puppies’ behaviour. The results from the breeders showed that there was a statistically significant difference between the American Staffordshire terrier and Whippet puppies in their curiosity and the way they behaved socially. The outcome of the study is very interesting because it could mean that the breeding not only affects the behaviours of the adult dogs, but also the behavioural patterns of puppies. The results from the veterinarians showed that there was no difference between the breeds. The difference in results between the two groups could be due to the fact that different questions were asked, they have different preferences for the breeds, meet them in different environments, for different lengths of time or other sources of error. Further studies in this area are needed to investigate when the differences, which give dogs the title of the most varied species ethologically speaking, begin to appear.
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