Cheez-it has some straggling fleas, he is on advantage and has been biting behind his legs the last 3 days. I checked him but it is really hard if not impossible with his puppy fur to see his skin. I found 3 little marks, that look sort of like healing pimples on his back leg, one has a little black head to it. It doesnt look like a living thing, but could it be a tick? I check him for fleas everyday, and my house is treated and so is my yard, but there is no avoiding the fleas as we live near the beach that has many feral cats and such. He gets chewing and will not stop no matter what I say/do. What should I do? and how do I know if that blackhead is a tick?? Im going to make him a cone this evening out of corrugated viynal sheeting so he will at least stop chewing for the time being.