My fur baby Bailey was recently diagnosed with diabetes on 5-27-14. We are rather new to this. Bailey is on 2u of Lantus Bid. I have been noticing his postperandium BG are becoming high the last few days. Slowly creeping higher. At the same time of Bailey's diabetes diagnosis he was put on doxycycline. I was reading online that doxycycline can interfere with insulin. Has anyone ever experienced any issues with doxycycline in their diabetic cats?