I never have problems with fleas on my dog, but she is always coming home with 4 or more ticks, and it seems the on the spot treatments are not working. (1800petmeds.com)
I was having a real problem with fleas, this product does the job. (amazon.com)
The vet said that there is a really BIG problem with these flea products sold online and suggested trying to get our money back... of course the return window was closed a while ago. (amazon.com)