My Vet. prescribed an antibiotic for my dog's hernia?

A hernia is not a tear in the muscle , that would be rupture otherwise .A hernia is a natural gap in the body wall , normally there will be a cause for the hernia to form . Your dog may have a prostate problem causing blood in urine and pushing a bit of body fat into the hernia by the enlarged prostate gland . He will need to correct the underlying problem and the hernia could be repaired surgically .