Ditto. One of my dogs and I take 1500mg daily. He's 125lbs. I can't believe the difference it makes for both of us. He is 13 years old. I was looking at artificial knees until I started taking this.
I put my dog (a Sheltie) on Glaucosamine and Condroitin (instead of the Pfizer drug the Vet recommended) over a year ago, but I saw no visible difference whatsoever in her condition. Perhaps I didn't give her enough of it.