I have had my guinea pigs for 3 weeks, got them from pets at home but soon after I got them Soot who is 23 weeks old developed a URI. He's been on baytril for a week now and does seem better (he's been eating and drinking fine throughout). I went back to the vets yesterday and they have prescribed another week of Baytril so I was just wondering if its normal it to take 2 weeks of antibiotics to clear up URIs?