Other forms: mutts
A mutt is a dog of no particular breed. Said with rough affection, or with mild scorn.
Mongrel is the neutral British word and mutt is the friendlier American one, and crossbreed is what a vet writes when the parents are known. There is a real health argument here, since mixed ancestry generally means fewer inherited problems than a narrowly bred pedigree. The word is informal throughout. Applied to a person it is a mild insult and usually a joking one.
1nounmuttA dog of mixed or unknown breeding.
“He is a mutt of some sort and the best dog I have had.”
Also accepted in games: mongrel
a clipping of muttonhead.
Etymology from Wiktionary, CC BY-SA