Another point is that enrofloxacin (baytril) can permanently damage the cartilage in the joints of fast growing animals. It isn't used in dogs or cats that are between 2 and 10 months of age for this reason. Since this drug isn't licenced for use in cattle in Canada, I can't answer if it damages cattle as well, but I know that it's cousin, ciprofloxacin isn't used in children because of joint damage, so I'd be really suspicious...