We recommend NuVet Plus!
I initially began using this product for my 13 yr old Wolfdog. It really helped him with the digestive problems that plagued him in old age. Unfortunately, I lost him. No matter what help you give them, they don't get to live forever. But his last year was more comfortable for him.
I still use this on all my Labs. It gives puppies an immune system boost, keeps my breeding bitches healthier and stronger, and keeps my retired oldsters healthier with lessened chances for some serious diseases. It is great for dogs with allergies!