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Thanks, sheribee, My vet said that he will probably have to be on this diet for the rest of his life, but to be honest, I don't care what it costs, he's worth it. My only problem will be stopping the girls eating his food! I went to see him today and he was so pleased to see me, purring and snuggling up to me. He was really upset when I left, miaowing and pawing at the cage he's in - I felt rotten, thinking I'd only upset him by going to visit.
Bednobs, they didn't give him the diazepam because of stress, they gave it to him as a relaxant, so his bladder would empty normally. Like I said before, anyone who's had cystitis will know what it feels like - you think you're busting to go, but when you do, there's nothing there because the bladder has gone into spasm & won't relax enough to allow you to go. It seems to be working for Monty as he's peeing normally now (no blood either) and is tucking into his new diet too. Can't wait to get him home on Thursday night.