Appearance
Dogs interbreed freely so mixed-breed dogs vary in size, shape, and color, making them difficult to classify physically. Mixed-breed dogs manifest a wide variety of appearances. However, if a genetically diverse population continues to interbreed, subsequent generations do tend 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.
Read more about this topic: Mongrel
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