I tried it and it did nothing. I do not know what to do with my dog Noah. Suddenly he is immune to every flea med on the market. My other dog is fine. Im at my wits end. I called the vet last week and they pretty much said they had no idea where to go from here.
The last one that worked was Advamntix but now its not working anymore either. Hes a rough coated border collie so I even shaved a spot to apply the meds to be sure it went in the skin. Hes still itching. We have treated the entire house, washed everything etc.
I'm a little disappointed with your Vet as your situation is quite common and has a solution. That solution is neither cheap nor easy and will not happen quickly (90-120 days).
1)Fleas do not prefer one animal to another, they are equal opportunity, ALL of your animals have fleas. This includes not only house pets, but also any garage or porch animals or barn animals if any portion of the barn is heated. If not EVERY animal is treated correctly then fleas will persist.
2)a]Fleas do not make animals itch. b]Flea allergies do make animals itch. c]Allergies can lead to bacterial skin infections. An animal with a skin infection, caused by an allergic reaction, caused by fleas; MUST have all 3 conditions treated to achieve success.
3)Animals do not become immune or resistant to medications, rather bacteria and parasites that infect and infest them build up resistance. Clearly that wouldn't happen to just one animal in a population and flea resistance is quite uncommon, especially resistance to multiple medications. FAR more frequent is owners lack of understanding leading to incorrect administration of flea products. The most common errors are; applying at greater than 1 month intervals, not applying to ALL animals in a population, not applying for a minimum of 3 months, allowing the medication to be 'resucked' back into the tube during application, treating with multiple medications that limit each others usefulness and getting the animal wet 48 hours before or after application.
In my experience, owners treating the environment typically fails as they rarely (frankly I never seen it done right) do it correctly. Mind you I don't think owners are stupid or lazy, rather correctly treating a house is not intuitively obvious and takes considerable effort. Even if owners do treat the house correctly once they typically do not repeat the treatments at 2 week intervals for a minimum of 3 treatments. Unfortunately, treating the house simply becomes a waste of time and effort that would have been better served in using the newer topicals or pills correctly.
Dr Taylor