I have a dog and two rabbits and I need to know what can I use on my dog for flea medication?

My dog or rabbits do not have fleas, but I am going camping soon and taking my lab with me. I want to use a flea and tick medication, but I need it to be safe to use around the rabbits because they have free rein in the house together with the dog. They all get along and I just don't want any bunnies grooming the dog with a flea medication that can be harmful. I bought a Hartz flea and tick collar and have not used it yet because I am unsure about using it around the bunnies.