Hi I have a rescued rat that I have had for about 6 months now and he has a bad URI. He lost over 100 grams in weight and looks very sick and has lost weight. His brother was also like this and looked like he was about to die but made a full recovery. My current sick rat is so skinny and won’t eat and is on strong antibiotics(vet prescribed) and will be on them for 3 weeks. I keep having this issue and wonder if it’s because I’m doing something wrong. I’m using bath mats in the cage and spot cleaning every day. Is there something better that will help with the URIs. Everyone has recommended bath mats to me but they don’t seem to work. I’m in need of some help!!! The picture is of my sick boy.