Have 2 indoor only cats, 5 years old. Noticed last week the male wasn't pooping as frequently as he had been. Urinating fine. He is eating and drinking normal. Had a BM Tuesday night, he wasn't quite himself, not as social as usual. Took him to the Vet Thursday morning, they kept him overnite, he wouldn't eat at all while he was there and no BM. They did abdominal x-rays and the report showed normal. Brought him home Friday, he pooped Saturday night and nothing since then. I have been giving him 1/4 tsp. of Benefiber a day since Friday. Nothing has changed about his environment or food. What in the world is going on?