On all four of my guys, toward the end of the month period that Trifexis is supposed to keep Fleas off of them, I'm finding a few Fleas !
Is this something that someone else here has noticed ?
Do some Fleas become "immune" to given chemicals ?
I could go back to HeartGuard for the worm protection, then...
I have a choice, Comfortis, Frontline...
any others which someone has had good luck with ?
Or do I just need to buy a Hammer !
PS:
All of them have been on Trifexis for at least a year.