i have never experienced fleas in winter before, but this year we can't seem to get rid of them. It's not a bad infestation, just keep finding a couple every week...on her. She is dosed up to the eyeballs. In the last 3 months, the dog has had frontline plus, advocate and bravecto. We have also sprayed whole house with spray from vet and washed all soft furnishings. And yet I still find the odd one on her tummy! She walks with other dogs throughout the working week, but I have just found one on her! I would have thought that they wouldn't of survived on her. Any tips??