Welcome and thanks for asking your question. My name is***** am a licensed veterinarian. I am happy to answer your question today. First I need to ask you a few questions so that I can be well informed and give you the best advice. There may be a slight delay between your follow ups and my replies as I type out a thorough reply for you.
1- Is he lame in one leg or you are seeing in both back legs?
Friend, the increase water intake is a side effect of the prednisone. It seems like reducing the dose to 5mg he becomes lame. You need to increase the dose back to where it was before. I would also speak to your family veterinarian about starting him on Tramadol, this medication may help in reducing the dose of prednisone. In the meantime for the vomiting this is what you can do:
Sorry, for some reason my answer was lost. Give me a few minutes as I type another answer.
1- Start him on Zantac (ranitidine) 75mg 1/4 tablet every 12 hours. Leave him on zantac as long as he on prednisone, this will help with the vomiting. When you give the prednisone always give it with some food, it will be more gentle on his stomach. You can buy Zantac over the counter in any pharmacy. 2- No food or water for 4-6 hours. Need to give his gastrointestinal tract time to rest. 3- After 4-6 hours offer a small amount of water. Wait half hour, if no vomiting, offer small amount of rice (50%) and boiled boneless chicken or ground beef (50%) 4-6 times a day. Keep on this diet for several days then wean into regular diet. 4- Follow up with your family veterinarian for a hands on examination. Please do not forget to rate my answer - I hope you found it to be excellent. If there’s more I can do, please use the reply tab and let me know. It’s my goal to provide you with excellent service." Thank you for your business and I hope to work with you again soon!Dr. Peter