Having been recommended by my vet, I decided to try this with my 10 year old Lab, who is beginning to get arthritic and show stiffness in her gait. After 30 days on Flexadin, I have definitely begun to notice a difference. She is walking out more easily and is generally more active showing fewer signs of stiffness. This is only our second month, but so far I am delighted with the results. Time will tell, however , when we get the colder weather how she fares.