On the one hand, human chondroitin is usually extracted from animal bones, which means that they may be contaminated by pathogenic microorganisms. On the other hand, because the body structure of dogs is different from that of humans, their joints and health need different treatment methods. So chondroitin may not be suitable for all dogs.
Besides safety, there are other better ways to improve the joint and bone health of dogs. For example, regular exercise helps to promote the growth of bones and muscles in dogs, while eating foods rich in omega-3 fatty acids can reduce inflammation and joint pain.
Although it may be beneficial for dogs to eat chondroitin, there are also safety problems and other feasible methods. If you want to know more about how to improve the health of dog joints and bones, you'd better consult a dog professional.