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| | The Ultimate Mixed-breed dog Dog Breeds Information Guide and Reference (Site not responding. Last check: 2007-09-17) |
 | | While this tradition is changing, some sports still remain open only to one breed of dog, such as greyhound racing, or to one type of dog, such as sheepdog trials open only to dogs of known herding ancestry. |
 | | Some kennel clubs, whose purpose is to promote purebred dogs, still exclude mixed breeds from their performance events. |
 | | Mixed-breed dogs, however, are difficult to classify except according to height; there is tremendous variation in physical traits such as coat, skeletal structure, gait, ear set, eye shape and color, and so on. |
| www.dogluvers.com /dog_breeds/Mixed-breed_dog (1992 words) |
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