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Schematic anatomy of the ear. In dogs, the ear canal has a "L" shape, with the vertical canal (first half) and the horizontal canal (deeper half, ending with the eardrum) The frequency range of dog hearing is between 16–40 Hz (compared to 20–70 Hz for humans) and up to 45–60 kHz (compared to 13–20 kHz for humans), which means that dogs ...
A group of Labradoodle assistance dogs. This is a list of common dog crossbreeds.These are crossbreed dogs created deliberately by crossing two purebred dogs.Some are known as designer dogs and are bred as companion dogs, often given portmanteau names derived from those of the parent breeds; others are bred to combine specific working qualities inherent in the parent breeds.
The principal registry for Border Collies in the United States is the American Border Collie Association (ABCA), which is dedicated to the preservation of the traditional working dog. [40] The breed was also recognised in 1995 by the American Kennel Club (AKC) after occupying the AKC's Miscellaneous Class for over 50 years.
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".
Tricolor: Three clearly defined colors, usually either black, liver, or blue on the dog's upper parts, white underneath, with a tan border between and tan highlights; for example, the Smooth Collie, the Rough Collie, the Papillon, or the Sheltie. Tricolor can also refer to a dog whose coat is patched, usually two colors (such as black and tan ...
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A different gene, unaffected by coat color, can make the eyes blue. However, this gene is rare. It occurs occasionally in Border Collies and similar breeds, but is mostly seen in Siberian Huskies, which may have one or both eyes blue, regardless of their predominant coat color. [68]
A study of another Border Collie, Chaser, documented that he had learned the names and could associate them by verbal command with over 1,000 words. [ 129 ] One study of canine cognitive abilities found that dogs' capabilities are similar to those of horses , chimpanzees , or cats . [ 130 ]