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The Chihuahua [a] (or Spanish: Chihuahueño) is a Mexican breed of toy dog. It is named for the Mexican state of Chihuahua and is one of the smallest dog breeds in the world. [ 5 ] It is usually kept as a companion animal .
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.
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]
Bat ear: Erect, broad next to the head and rounded at the tip, such as the ears on a Chihuahua or a French Bulldog. Button ear: A smaller ear where the tip folds forward nearly to the skull, forming a V, as in the Jack Russell Terrier. Cropped ear: Shaped by cutting; see cropping.
In mammalian oral anatomy, the canine teeth, also called cuspids, dogteeth, eye teeth, vampire teeth, or fangs, are the relatively long, pointed teeth. In the context of the upper jaw, they are also known as fangs. They can appear more flattened, however, causing them to resemble incisors and leading them to be called incisiform. They developed ...
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Selection of different dog breeds. This list of dog breeds includes both extant and extinct dog breeds, varieties and types.A research article on dog genomics published in Science/AAAS defines modern dog breeds as "a recent invention defined by conformation to a physical ideal and purity of lineage".
It was theorized that positive selection for shovel-shaped incisors over the spatulate incisors is more commonly found within cultures that used their teeth as tools due to a greater structural strength in increased shovel-shaped incisors. [2] In some instances, incisors can present a more pronounced version of this called double shovel-shaped.