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BYVET JOINT HEAL^TM (BJH) contains mucopolysaccharide protein, chondroitin sulfate, type II collagen, and omega-3 fatty acids, which protect and prevent osteoarthritis (OA)-associated tissue damage and degradation in dogs and cats. This study aimed to generate a novel dietary supplement and evaluate its prevention and therapeutic efficacy in an OA Sprague Dawley rat model induced using monosodium iodoacetate (MIA). Negative control, MIA-induced OA control (MIA), OA rats treated with BJH three weeks after (M+BJH3) and those treated two weeks before and three weeks after OA induction (BJH2+M+BJH3) groups were assigned. M+BJH3 and BJH2+M+BJH3 had similar mean body weight increases until 29 days. BJH2+M+BJH3 showed a significantly higher body weight than M+BJH3 and MIA on the final day. Interleukin-1β in BJH2+M+BJH3 was significantly lower than that in MIA. Tumor necrosis factor-α, aggrecan, matrix metalloproteinases13, and cyclooxygenase-2 levels in M+BJH3 and BJH2+M+BJH3 significantly differed compared to those in MIA. BJH administration before OA induction significantly decreased OA severity and functional recovery. Consuming a BJH supplement showed modifying and chondroprotective effects and significantly reduced cartilage degeneration and inflammation with no side effects. Hence, our findings demonstrate the potential of using BJH as a safe therapeutic and preventive supplement for OA and associated cartilage abnormalities. Also, 30 dogs diagnosed with OA by a veterinarian participated in the clinical trial, and BJH was provided for 8 weeks. Blood tests (CBC, serum chemistry) and joint assessment were performed before and after the feeding, and the effects of a BJH supplement were compared. BJH supplement was easy to administer, and no side effects were reported. Feeding BJH supplementation alone to dogs with arthritis had an overall positive effect on arthritis scores for 8 weeks without any other treatment, including non-steroidal drugs. Full article