I am sorry to hear that Lillie is not rebounding as quickly as you (and we) would want. I would caution you against dropping/changing her meds without talking with your vet. If you have confidence in him, then you need to follow through with his advice. If you don't have confidence in him, then you need to get Lillie to another vet for a second opinion. It has been my experience with Maggie that antibiotics kick in pretty quickly -- have never had to wait four days for that to happen. Why did your vet prescribe Metacam? It is my understanding that that is usually prescribed for inflammation related to arthritic conditions. Any meds can cause an upset stomach if not enough food is consumed. Baytril has upset Maggie's stomach, particularly if she is not eating. Sending gentle hugs to you and Lillie!