Our 14 year old cat has always gone outside to do his business. However, about 4 weeks ago he was attacked by a dog. He had to have a broken leg pinned and had complications going septic and then a blood clot. He seems to be slowly regaining use of his hind legs. He has had diarrhea since we brought him home 2 1/2 weeks ago. We have to be there to clean up after he poops or pees. Any suggestions on teaching an old cat to use a litter box? We are hopeful that his legs will continue to improve. But, eventually, he must be able to get around and do his business on his own. Thanks for your suggestions.