My cat won't use the liter box

My 13 year old cat has decided to stop using the liter box. I have two male cats, they have lived together all their lives and shared the same liter box. The one has decided to wee on the plastic around the box on the floor and poop in the dining room. Nothing has changed in his life, except we have a new outside dog (about 9 months). He is an inside/outside cat, mostly outside. His health is good, but we are doing a round of antibiotics to be sure. Any help?

Answer #1

It may have a uninary tract infection so I would take it to the vet to get it checked out.

Answer #2

is the box clean?

maybe hes constipated or has the runs

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