Frontline has been defeated
I've bought three packs of Frontline Plus in the past year for my cat. The first dose of this summer lasted all month. After applying the second dose, it seemed not to stick. She was still scratching two weeks later and then I saw two very calm, live fleas crawl by her ear. I was really angry to have to treat her again so early. This happened with the first pack, but I thought it was a fluke. I just made a mistake. It's really difficult to see past her dense undercoat. But now I wonder if it does work.
What are some effective alternative flea treatments that you would trust most? I've been considering Seresto collar as it kills existing fleas and repels others.
I have the Enforcer Home Spray with Nylar which I used in most of the house so far. I know if Ruthie's treatments don't work we'll have a re-infestation in no time.
(Some unsolicited advice: If you buy a house, don't keep the left-behind sofa, no matter how nice it looks. )