This is an incredible hip and joint preventative for dogs. Especially for senior dogs who have developed hip and joint problems. My vet recommended them. My rottie/lab mix was 7 years old when she started taking them. She showed improvement within a week of beginning the stuff. In a month she was running around like a youngster. Vet recommended that I give Cosequin DS Plus to my 5 year old pom when he developed a bad knee. He is much happier now that he can run with the pack. I give them to my lab/pit mix as a preventative. Very happy this product. The only reason I gave it a 4 star is because twice I have found broken tablets when I opened the bottle. SOme I could use but others I had to throw away. I hope this won't be a trend.