This stuff really works. My Ragdoll kept throwing up all over the house - sometimes just bile, sometimes whole chunks of food mixed with hair, the works. (I know, gross, but I want to be detailed in case someone else is having this issue.) She has a clean bill of health from the vet, so I was at an utter loss as to what the problem might be. I realized she wasn't going to the bathroom very much and was just throwing up, so it occurred to me that perhaps her stomach was sensitive, as she was a dainty eater, and couldn't handle the fur build-up from her grooming sessions. After researching online and seeing that vets recommend this specific brand, then reading reviews on Amazon, I decided to go for it and ordered the 3.5lb bag to see how Blue did.Wow. Drastic difference. I tried a slow transition from her old cat food to the Science Diet, but Blue wasn't having any of it. As soon as she realized I had mixed in the Science Diet crunchies into the old ones, she began picking out only the Science Diet and leaving the old. I finally gave up, ruing the money lost on the old crunchies, and now give her only Science Diet. She is more excited now for her hard food than for her soft food! If she hears me pouring her crunchies, she comes running.Results after only a few days (unbelievably): Blue now eats with gusto and is using her litter box normally, so her digestion is definitely back on track. Her fur is softer and shinier than ever before, and there has been no more throw-up/hairballs since she began eating Science Diet. This was not a long transition, either - I started her on Science Diet May 12 and the change was immediate. Even my boyfriend, who was skeptical that it was working that quickly, had to admit to me a few days ago that it was undeniable how much obvious good it has done her.Two thumbs way, way up.