There isn't really anything about being paralyzed that makes a dog more likely to get diarrhea than usual. They're pretty much like other dogs in that. They would usually get it for the same reasons unparalyzed dogs do, such as something they ate. Do you have any kids in the house giving him Christmas treats or anything?
Some medications might cause it, such as the steroids you mentioned. With steroids, they recommend giving the dog a stomach protectant, for example Pepcid ac (the vet would know the dosage), but you said he is off the steroids. Did you try looking up the medication he is on now every other day, to see if it can cause tummy problems? Or maybe calling the clinic and asking them if it might be the cause?
There are other things that can cause diarrhea, and one that comes to mind is pancreatitis. That can be brought on by stress (or sometimes for unknown reasons) and it is treatable. I think if it was my dog, I would call the vet and report the little bit of diarrhea you noticed, and see if they want to change the medication or add a stomach protectant or maybe bring him in for a quick office exam and take his temp and feel his belly, etc. I think I'd call them today, because it's no fun to have a paralyzed dog with diarrhea.
I was also wondering if anyone could tell me if the progress he has made is good & if he has a chance of ever walking again. My vet gave me a 0% chance that my dog will ever walk again and that I need to put him to sleep however that is NOT an option for me. But he can take multiple steps but has trouble getting grip and I don’t know how to help improve this for him
I think it sounds hopeful if your guy has regained feeling in his back legs. We did acupuncture and physical therapy with our girl. I think it is always worth giving them every opportunity you can. I'm sorry your vet recommended putting him to sleep. We have a parlayed cat who we found as a kitten down in her back,, she is 14 years old now and is very happy. We adopted a 7 year old Frenchie who was in the same condition and she lived a very full life being parlayed as well. We just adopted a 3 year old who ruptured a disc and the outlook doesn't look favorable for him to walk but I know what matters most is that they are pain free and happy.
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