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- Mixed-breed dog, a dog whose ancestry is complex or not known
- Grade horse, a horse whose parentage is unknown, unidentifiable, or of significantly mixed breeding
- A domestic short-haired cat or domestic long-haired cat of no particular breed, colloquially called a "moggy" or "moggie" in some dialects
- Crossbreed - where the animal's parentage is deliberately selected
- Hybrid - a mix between species.