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"mutt" is also used as a crossword clue. If that's what you saw, the answer is often cur (3 letters).
Definitions
an inferior dog or one of mixed breed
Used in a sentence
“Mr. Beerbelly, Beerbelly / Get these mutts away from me / You know, I don't find this stuff amusing anymore”
““I knew you weren’t such a mutt as you looked,” she cried.”
“I must say I think Chloe was a bit of a mutt to walk on the bed and then leave a button somewhere about. She might have learned better than that from the pictures surely.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Mixed-breed dog”4 letters
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