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A mongrel or mutt is a dog of unknown ancestry that belongs to no single organizationally recognized breed and is not the result of selective breeding.
When breeds mix, their offspring manifest a wide variety of appearances; some resembling one breed closely, while others clearly exhibit features of both. However, as mixed breeds continue to interbreed, subsequent generations moderate toward a roughly similar appearance. They tend to be fawn or black and weigh about 18 kg (40 lb) and typically stand between 38 and 57 cm (15 and 23 inches) tall at the withers.