I ordered a box of advantage for dogs over 55 pounds for 35.00, it has four tubes in it which i thought was a good deal. My home is infested with fleas, I thought it was working at first because they were not itching but i was wrong, way wrong! My whole house and my dogs are infested with fleas. The product says it would take a half hour and would kill all fleas and larvae. I can almost bet that this is a big scam. A product well known as ADVANTAGE would work like it says. I am a very upset customer and would greatly appreciate my money back.