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Chihuahua
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 15 and 23 cm however, some dogs grow as tall as 30 to 38 cm . Both British and American breed standards state that a Chihuahua must not weigh more than 2.7 kg for conformation. However, the British standard also states that a weight of 1.8–2.7 kg is preferred. A clause stating that 'if two dogs are equally good in type, the more diminutive one is preferred' was removed in 2009. The Fédération Cynologique Internationale (FCI) standard calls for dogs ideally between 1.5 and 3.0 kg, although smaller ones are acceptable in the show ring.
Pet-quality Chihuahuas (that is, those bred or purchased as companions rather than show dogs) often range above these weights, even above ten pounds if they have large bone structures or are allowed to become overweight. This does not mean that they are not purebred Chihuahuas; they do not meet the requirements to enter a conformation show. Oversized Chihuahuas are seen in some of the best, and worst, bloodlines. Chihuahuas do not breed true for size, and puppies from the same litter can mature drastically different sizes from one another. As well, larger breeding females are less likely to experience dystocia. Typically, the breed standard for both the long and short coat chihuahua will be identical except for the description of the coat. Chihuahuas have large, round eyes and large, erect ears, set in a high, dramatically rounded skull.
The Kennel Club in the United Kingdom and the American Kennel Club in the United States recognize only two varieties of Chihuahua: the long-coat, and the smooth-coat, also referred to as short-haired. They are genetically the same breed. The term smooth-coat does not mean that the hair is necessarily smooth, as the hair can range from having a velvet touch to a whiskery feeling. Long-haired Chihuahuas are actually smoother to the touch, having soft, fine guard hairs and a downy undercoat, which gives them their fluffy appearance. Unlike many long-haired breeds, long-haired Chihuahuas require no trimming and minimal grooming. Contrary to popular belief, the long-haired breed also typically sheds less than its short-haired counterparts. It may take up to three or more years before a full long-haired coat develops.According to the American Canine Hybrid Club, here are some of the recognized hybrid breeds & their unique mixed-breed names
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