Hello, about two months ago me and my family adopted a puppy that was hit by a car in front of my house. I can't tell his age for sure, but the vet estimated 2 months, so he must be around 4 months old by now. Despite the car accident, he only got damaged in his left hind leg, which is completely cured by now.
However, about a week and a half ago he started to show muscle spasms in his front-right leg that never cease or diminish, even when he is sleeping, and exactly a week ago (wednesday) he started to cry and whine when he is not playing around or barking at the street, it always happens when he's resting or trying to sleep, but no signs when he's active.
We took him to a vet that wednesday and he suspected canine distemper (there's been an epidemy around here these days), so we've been medicating him with ribavirin+vitA&C+DMSO, together with some antibiotics (he was diagnosed with low immunity), dipyrone and a muscle relaxant, as prescribed by the vet. He has a few pustules in his belly, I heard this could also indicate distemper, but it's worth to mention that he's always had them ever since we adopted him. The vet also did a distemper test with the dog's saliva and it resulted negative, but he told us that false-negatives are very common for this disease.
The vet warned us that even with the medications his survival chances are far from great and that his condition could (and probably would) worsen, so we've been already expecting that, but his condition right now is really, really odd. His spasms haven't changed at all and it still affects only his front-right leg, same intensity. My father said that with certain positions the spasms cease, but I've not presenced it yet. He can still walk/run and play around with ease, biting a lot whe playing as he ever did. He has no diarrhea, no vomiting, no rough noise or paws or any other symptoms of distemper, eats a lot (until he can barely walk if we allow it) but he's been crying and whining A LOT when resting, and he keeps moving around when doing so, it's like he can't get quiet, this has been increasing everyday (the vet had already told us that this is not a pain caused but a neural condition instead).
I've never seen or heard about any case of a dog with distemper that shows these symptoms. We called the vet today and he prescribed phenobarbital, the first dose didn't make any difference yet so we'll keep doing it. We've been suspecting that he might have some mental illness but I can't find enough information about it. Has anyone ever seen a case like these? Is this all really a sign of distemper? I've been researching but I really can't find anything related to it, any kind of information would come in hand! Thank you!