First of all, why didn't you first start with the "go to" URI antibiotic? But on that note, you think Doxycycline smells (tastes) horrible, you haven't tasted the "go to" antibiotic, which is SO bitter and disgusting that rats often won't touch it, even after you've added it to straight Maple syrup or something comparible. In fact, the injections can literally BURN them, causing an ugly burn bruise at the site. It's actually called: Baytril Burn, and is a well-known side-effect to vets, which is why it is diluted in a sweet solution when given orally and a sterile vehicle when given subcutaneously. In any case, why didn't you start with this antibiotic???