In December of '09 i brought in a lovable stray kitten. I took him to the vet, got him healthy and everything was great. The only problem is that i didn't think about the fleas. all was good for a while and he only scratched himself now and again, so i didn't really think there was a flea problem. But when spring came around my entire house got infested with hundreds of fleas. My poor little chihuahua was covered in hundreds of them, and my cat was full of bites and scabs. I bathed both of them, tried several other flea treatments including collars, sprays and dips, and nothing worked. Those darn fleas kept coming back and multiplying faster than ever. So after my dog lost most of her hair from flea allergies, my cat would scratch non-stop, and i was covered in little red bumps, i decided to try out advantage which had really good reviews. I bought Advantage for cats, and one for dogs. Within an hour of applying this stuff on the animals, i saw about 25 fleas on the bed barely moving or dead. and within a week those hundreds and hundreds of fleas just died. at last my pets and i had some peace. I am truly grateful for Advantage. The doses on the dog had to be repeated every week or so because she had the most fleas, but it did the job wonderfully. I would highly recommend buying this product, especially from Amazon since the same stuff can cost you $60-$80 at a pet store.