I chose other. I use no chemicals unless they have more than a few fleas in a short timespan and then I will use frontline. I've used it once on one dog this year.

I do however use a flea comb to check their coats after an outing. Fleas are common where I live I think because I'm across the field from a local dog park. I may find as little as one adult flea on one of the dogs and comb through their whole bodies and find no others. I prefer to catch them early before they can reproduce and before I even find any flea poop on them. I haven't had a full infestation with these dogs ever.