Of a pet: trained not to excrete indoors.(adjective)
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Use "house-trained" in a sentence
"It is house-trained and I am willing to clean up its mess outside, if you'd like."
"They must have decent manners, be house-trained and well-groomed, and they must not be "food thieves … have constant flatulence, snore loudly or be excessive droolers," says Palika."
"That led one journalist to wonder whether the Norwegian universities believe that I am "not entirely house-trained.""