Malik is now, saw his vet this morning and has weak anal muscles, which explains why we find, on occasion, a ping pong ball size of poop on his bed, pretty firm. Vet said his sphincter should tighten around his finger during the probing and it doesn't.
The vet said "the whole assembly line" isn't working very well, he has a lot of poop backed up, which we saw last November in an xray for a different problem. An enema wouldn't do much as it would just clear the end part of the pipe. He thinks putting him on a low-fiber diet is better, to avoid creating lots of bulk with a fiber-rich diet. So he wants Malik on Science Diet ID, which we tried before, and can't remember why we stopped. I'm not thrilled about the choice and wonder if any of you have a better or any suggestion. My vet is great, but is a business man as he has to run his clinic, and he sells Science Diet products so I suspect he pushed that some.
As a note, Malik gets 3 to 4 walks a day, so plenty of chances to eliminate, yet, like my hb says, we can't squeeze it out of him if he's not ready