We live where there are lots of ticks. I have always used Frontline Plus because our vet practice recommends it. But I have the rescue dachshund Shamus that I've tried to put it on twice and he started spnning, rolling and got whale-eyed both times. I wiped it off and called the vet. They've never heard of that reaction, but I'm really nervous about using it again. Is there something holistic/natural out there to use for ticks?