I have an 11 year old steer who is a pet with diarhea and weight loss...He is my only cow...I have had a stool sample to the vet and they have given him SMZ 10 days, probiotic paste 14 days, Bolluses for the runs and Endosorb Suspension which he has had for 5 days....no better with the runs...He is eating and acting normal...except for the stool and weight loss...He has been on bute for 4 years... 4grams ...his hip is bone on bone...The vets are clueless and at this point are no help...I don't know if it is his age or if he has ulcers...when they did the stool culture they said there was no blood in his stool....any suggestions on what to do...someone said possibly Johnes but there is no way he could have come in contact with the bacteria...