I have a 8mo Silkie roo that up until 3 days ago was perfectly healthy. He started stumbling while walking and within 5 hours unable to bear weight. He can still move his legs and sits with them straight out in front. He is on the skinny side and I never noticed it until now because of his fluffy feathers. He is eating and drinking and pooping. I have given high protein food, vet RX and nutri drench. What else can I do to help my Charlie?