So far the only way I've found to get him to urinate is to put him in the carrier with a puppy pad and take him out to the car. I'm afraid he's going to catch on to that trick pretty soon, though.
I'm going to have another conversation with the vet tomorrow, because there's got to be some way to persuade him to go more frequently and in his litter box. It's crazy--we've gone from too many trips to the box to far too few.
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