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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.
Several potential personality traits have been identified in dogs, for instance "Playfulness", "Curiosity/Fearlessness, "Chase-proneness", "Sociability and Aggressiveness" and "Shyness–Boldness". [29] [30] A meta-analysis of 51 published peer reviewed articles identified seven dimensions of canine personality: [21]
McKenzie Cordell. Paired with a wagging tail, this typically means your dog is happy and calm. If you hear growls or aggressive behavior, it means your pup is ready to pounce.
In 2020, the sequencing of ancient dog genome indicates that in two Mexican breeds the Chihuahua and Xoloitzcuintli derive 4% and 3% of their ancestry from pre-colonial dogs, [10] almost entirely being descended from Eurasian dogs. Their phenotype is a consequence of canine ectodermal dysplasia caused by a mutation on the FOXI3 autosomal gene. [11]
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A dog breed will consistently produce the physical traits, movement and temperament that were developed over decades of selective breeding. For each breed they recognize, kennel clubs and breed registries usually maintain and publish a breed standard which is a written description of the ideal specimen of the breed.
As such, humans have long used dogs for their desirable traits to complete or fulfill a certain work or role. 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]