Is there one brand that is better for dogs? The vet brand is rather expensive vs what you can get at the drug store, is it different than the standard CVS or Walgreens brands?

Search. Just had a thread on this.

This from Tractor Supply (and other places) works very well with our basset hound and GSD. From what I can tell, the cost per dose is lowest and the owner of the company is happy to answer questions via e-mail.

Liquid-Vet Hip & Joint Supplement