I use Dasuquin and did see improvement in my dog. It also caused him to itch so I will be switching to Cosequin to see if that helps without causing the itching. You can get it on Amazon and you just have to keep an eye on it for the best price.
Rusti EAC, TN-N, TG-O, WV-N, NCC, NJC, CGC, GSD Diva
Jerry Lee AXP, MJP, OAC, TN-N, WV-N, NCC, NJC, SPJ, UAG1