We have just ordered one thing, NuVet Plus, for years on auto refill--and, every time I make a change to the refill schedule, there has never been a problem; NuVet's service and delivery are just excellent. My dogs are 14 and 15 and have been eating the supplements since 9 or 10. They race around not like puppies but, given their advanced ages, they are doing really well. Whatever combination of things we are doing--the product, plus the food we give them and a good veterinarian--well, the dogs are alive and well. I was referred to the company by my daughter, whose Jack Russell lived for 16 years. NuVet has done very well for her dogs too.