Within 3 days of using your system, I noticed improvement the way Maggie was walking. She is a 13 year old shih tzu in good health except for arthritis in her hips and a previous ACL tear that was surgically corrected 2 years ago. Once there is ACL problems with one knee, then the other one will eventually have issues, which is happening. This system has helped her so much and she is getting around alot better. Thank you for helping my little Maggie girl.