My 14 year old Whippet gets a bit stiff in the hips lately and so I had high hopes for this product, as I heard a lot of good things about it. But, after only three doses she developed a mean colitis which had to be treated by my vet. Huffle has a sensitive digestive system and according to my vet the ingredient glucosamine often triggers tummy upsets. So I would recommend the product only for dogs with somewhat resistant bowels.