My guinea pigs are being treated for a possible URI, and we got doxycycline today to give with the Baytril for ten days. First of all, to anyone who's every gotten doxycycline, is it usually so expensive? Mines was 108 US dollars. Secondly, they are each getting .5 mL of Baytril twice daily, and the dose for this one is .55 mL. Since we are giving the antibiotics together, is this too much? I trust my vet ofc but just making sure couldn't hurt. Hope to hear a reply soon!