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Hi. My name is***** Thank you for your question about Columbus. I'm sorry to hear about this situation with him. The thickening of the intestinal tract has me concerned for lymphoma or IBS also. I'm assuming that at this time the prednisone is being started as you're not going to go for further diagnostic steps to try and determine which of those is present. As far as the cystitis like signs that he's having, the stress of the recent vet visits combined with the new kittens in the house could be setting that off. The FUS syndrome is one that is still being learned about. Stress in general can set off events of it. How long could it take for him to get back to normal? That is up in the air. Some get better in a few days while others may take a week or so as long as the stressors subside. Could he have a urinary tract infection? That is the other concern. The wobbly on the rear legs, that isn't something that seems to fit with an FUS situation. The steroids can cause increase of drinking and urination, but the wobbly shouldn't be due to it.
I won't argue at all about just starting the steroids. It is honestly the option that most owners go for in the situation Columbus is in. If he was my cat, in the same situation, I would be doing the same thing. The wobbly back legs could be why he's not walking around as much. He could be getting weaker from what is going on and this is the underlying issue.
I'm extremely sorry for my delay in getting back to you. The weakened hind legs and the urinary issues could be due to kidney issues. When the kidneys aren't working as well, they can become more dehydrated and have waste products build up that can make them weaker. This is something that can be screened for with blood work and a urine evaluation. If the urine is being concentrated, it wouldn't seem as likely to be the kidneys as the issue.