Here are the latest results from Consumerlab’s tests for Chondroitin, Glucosamine and MSM for dogs and cats. 1800Petsmeds joint enhancer for small dogs and cats: only 70.5% of listed glucosamine hcl.
Joint Complete for Dogs and Cats (Liquid Solutions): 76% of glucosamine sulfate listed.
Joint Max Triple Strength Soft Chews: 135% of listed MSM.
Liquid Health Naturals K9 Glucosamine: only 16% of listed Chondroitin Sulfate.
Cosequin DS Plus MSM (Nutramax Lab): Approved
Cosequin Joint Health Supplement for Cats: Approved
Hope this helps users of these supplements.