Haven't posted in years, Maggi has been doing well on Lantus, everything fine until about three months ago when the middle section of her tail hair fell out. Vet gave a shot for infection, did nothing, I googled something and had some anti-fungal ointment which worked. tail hair almost entirely grown back but I noticed she has been losing weight a few weeks ago. She still eats her Royal Canin prescription food, still drinks and uses litter box. However, she is extremely lethargic, has been spending time in my lap until a few days ago and now prefers the wood floor by a window. I put blankets down for her a few days ago and she seems happy. She still purrs when I hold her but tonight she actually jumped into hubby's lap, purred like crazy, and he said how skinny she is. And she is. Yesterday I cut her Lantus amount in half since her body weight is down, thinking that may also be part of reason she is lethargic. Tomorrow I will call a vet for appointment but thought I'd check in here. She will be 15 in March. She still eats and drinks but less than usual.