I have an older dog who was hit by a car when she was younger. She severely fractured a front leg. It healed and she can run on it, but it gives her trouble. She has some arthritis in all of her legs, but it's worse in the previously injured leg. The glucosamine for dogs is very expensive, but some of the glucosamine packaged for humans looks to have the same ingredients and is much cheaper. I'm wondering if this is another case where they are just trying to profit and packaging it in a container with a dogs picture on the bottle and charging more or are there ingredients in the humans brand that are bad for dogs or things that are in the dog glucosamine not in the human brand. My uncle buys a wormer for his horse that's packaged for cows. They had a friend who chemically tested it, he worked in a lab, and it was the same, just packaged and priced different. Is that the case here. Please only respond if you your a vet or someone who really know what's going on and not someone who tried it once or knows someone who did. Thank you.