Great product. To give some backstory, I have a German shorthair who got run over as a pup which led to his leg being amputated. So now I got this 5 year old dog with 3 legs. I bought ruff greens and in just 2 weeks of him taking it, his leg is growing back! Unfortunately, we also had him neutered and his testicles grew back. So he bred with our cocker spaniel and we got 6 puppies, 5 of which have this tiny 4th leg. Looks like a normal dog but with some weird stub for a leg with fingernails. It's weird. The 6th puppy was just a leg with a head on it.... They're all doing fine so I know this product is very advanced in regeneration capabilities. I'll buy again.