Mixed Breed Dog Waving
Mixed Breed Dog

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A pet that is not purebred.
The ancestry of a mixed-breed is usually unknown, and the pet has characteristics of at least two breeds.
Mixed-breed dogs are also known as mongrel, moggie, mutt (USA), bitsa (Australian and New Zealand).  
Mixed-breed cats are also known as mongrel, moggie, alley cat, and - by cat associations - as non-pedigree, domestic cat, pet quality, household quality and household pet.
Cf. crossbreed