My 14 year old Sheltie suffers from arthritis and I have been trying to keep him off of the heavy duty pain medications because of possible side effects. Ark Naturals Joint Rescue supports that goal. Along with Vetoquinol Care Triglyceride Omega Supplement (formerly AllerG-3,) also available from Entirely Pets, Joint Rescue helps keep the old dog comfortable on all but the very worst days. The tablets are large and hard and I have to break them down for him, but that's a small inconvenience for a product that offers him a great deal of relief from pain and stiffness. I expect him to take this for the rest of his life.