We got a new puppy and as part of the one year health guarantee we had to put him on NuVet Labs vitamins. The puppy seems to be doing great with them and our vet thinks it's perfectly safe to give them to him. We also have an older dog who is 15.5 years old. I had to install ramps on the stairs and he was no longer able to jump on the couch and in general was having difficulty with his joints. I started the NuVet vitamins for this dog as well and he can now jump and climb the stairs! I Think they worked wonders for him. We have signed up for the auto ship, which is great because we don't have to remember to order them every 45 days. My way of thinking is that I take vitamins for the nutrition that I lack so I decided it must be the same for our pets as well. I cannot believe the difference it has made in our little dog!