I use Frontline Plus and I have found one or two on mine too. Is it our Florida weather and all the rain too? Mine have a doggy door and a small ramp that leads to a dog run. They go in and out all day. I have to check mine everyday. I hate it too to see one on mine.
__________________  My 6 Loves
Sassy, Gracie, Rosie, Rocky.....  Raindrop, and Candy |