I don't know about your rat's condition, but I use TB-500 for Bone Pain in both Hips, and it's helped me greatly. I split the dose between the affected area's, and I've been doing it about 4 weeks, and will continue to use. I hope your rat makes out OK. I almost forgot, my Drs. have been trying for 8 years, to do a double Hip replacement. I also had problems with steps, and walking in general, but not anymore. I've been training legs again. (1st time in 5 years), no pain. I love this stuff, so thankful that I ran across it. If you need a Peptide supplier, PM me, got a domestic, that's a Real Chemical Co.