Just wanted to give input on this product. I had my 10 yr old on Dr Foster & Smith Joint Care 2 for the last 4 years. She had surgery about 4 years ago, and has some arthritis in her knee and mild HD. I never saw much difference with the Foster & Smith, but that's mostly because we started right away and she didn't show much pain. But about a year ago I saw that she was showing more pain. I upped the dosage and she did better - til about 4 mos ago. She started showing more discomfort again. I've only been using the Springtime joint formula for several weeks now, but I've seen a difference already. It's not a miracle difference or anything, but she's showing less pain and seems to like it mixed into her food a lot. So things have improved enough that I think I'll stick with it for a while. Thanks to everyone who recommended it!