I had that and tried for a short period of time, although I was also using Frontline Plus. And then I stopped giving it, bc my Roxy had liver issues and I wasn't sure if she could use it (Bug Off) or not
I am back to using Frontline Plus. Roxy has has 2 ticks this season, the last week, I had found a tick almost burrowed into her leg. It took 5 mins to get out. Now the wound area is swollen like a big hazulnut. She was at the Vet immediatly, got a shot and antibi's
The Vet recommends Frontlone Plus ~ He says the diseases are far worse than the product...