We have two retired Greyhounds. Both had patchy fur and in particular their rears were pretty bald - poor guys! I read the reviews on here and decided to give this product a try. On the Greyhound who's fur was probably the worst it has worked beautifully and he now looks so healthy compared to before. My other Greyhound didn't have quite the same success. It has helped a lot but the skin on his back is now quite sensitive - not 100% sure if this is to do with the product but the timing ties in with when the sensitivity started. Don't get me wrong - it's not a big problem and overall I think the product has done what it says it will. Certainly worth a try - particularly for Greyhounds - the best pets ever!