However, a genetic study indicated that there was less than 2 percent pre-European mitochondrial DNA in modern Chihuahuas due to admixture with the European dogs.Wheeled dog toys in Mesoamerica depicting both 'apple' and 'deer' headed chihuahuas range from Mexico to El Salvador. Current breed standards defined by registries such as the AKC specify an 'apple-head' or 'apple-dome' skull conformation. Chihuahuas have large, round eyes and large, erect ears, set in a high, dramatically rounded skull. The stop is well defined, forming a near 90 degree angle where the muzzle meets the skull.Breed standards for this dog do not generally specify a height; only a weight and a description of their overall proportions. Generally, the height ranges between 6 and 9 in (15 and 23 cm); however, some dogs grow as tall as 30 to 38 cm (12 to 15 in). Both British and American breed standards state that a Chihuahua must not weigh more than 5.9 lb (2.7 kg) for conformation.
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