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The Chihuahua breed is a popular choice if you're looking for a toy-size breed. While they might be small in size, they are big in personality and aren't afraid to let you know just how they feel.
A 2018 study in Japan of pet cemetery data found the Chihuahua to have an average life expectancy of 11.8 years compared to 15.1 for crossbreeds and 13.7 overall. [26] A 2022 UK study on life expectancy of dog breeds based on veterinary data showed the average life expectancy to be 7.91 for the breed compared to 11.82 years for crossbreeds.
Their behavioural traits include guarding, herding, hunting, [21] retrieving, and scent detection. Their personality traits include hypersocial behavior, boldness, and aggression. [21] Present-day dogs are dispersed around the world. [27] An example of this dispersal is the numerous modern breeds of European lineage during the Victorian era. [22]
A 2019 genome wide association study concluded that a large proportion of behavioral variance across breeds is attributable to genetic factors. [111] Within breeds, the most heritable traits include characteristics selected for in breeding such as trainability, stranger directed aggression, chasing, and attachment/attention seeking.
Chihuahas are Washington's most popular dog breed, according to a recent study from U.S. News & World Report.
A mongrel, mixed-breed dog or mutt is a dog that does not belong to one officially recognized breed but can be a mix of two breeds and is not the result of intentional breeding. [59] In the United States, the term mixed-breed is a favored synonym over mongrel among individuals who wish to avoid negative connotations associated with the latter ...
A single-generation method of breeding is not as accurate or direct. The process is also more practical and easier to understand than sibling analysis. Selective breeding is better for traits such as physiology and behavior that are hard to measure because it requires fewer individuals to test than single-generation testing.
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