sorry Bronze. It took me a while to explain the X. My guys are strictly indoors too but all it would take would be for me or hubs to bring in one flea and wamo!Wow, I got a big red X. LOL! Bea, I'm telling you what the vet told me. And the people at the pet shop told me the exact same thing. As I said, that was a good five years ago. Oh, and I had neighbors who said they gave up on Frontline and switched to Advantage with mixed results. I used Advantage and it worked but I needed it only once (they were indoor cats).
I'm not saying there are never cases where your statement wasn't true…I too know it happens…but it happens rarely…but having been in the business I know the other side.
In fact we talked to our frontline rep about the client complaints and he told us that the company has a cat colony they have been treating with frontline for many years with good results.same cats, same environment, presumably same fleas and their offspring! And while I don't particularly trust pharma reps I do that one.