"My vet recommeded Pro Plan for Seniors. Yoshi will soon be 14 yrs old, he has arthritis in his right back leg. He will be walking and his joint would freeze and his back leg would get stuck in the air, I would have to massage it to get it back to a regular place. After using Pro Plan for Senior 2 weeks...no more problems! Yoshi has been eating Pro Pln Senior for over three years and his leg has not gotten 'stuck' since then!"