I would put my money on ignorance.

Baytril can cause muscle necrosis, so it's best to give subcutaneously and to dilute the dose with saline before injection. Also why I don't use it as a first-line treatment. 10 mg/kg every 48 hrs is the standard dose, but of course is pointless if the bug is resistant. Usually recommend a 20 day treatment, but perhaps I should listen to Dr. Stahl's radio show and see why he recommends 30.