I'm a huge fan and supporter of Revolution for dogs.  I love the multiple benefits from it; it takes care of heartworm, fleas, and mosquitos as well.  My vet even recommended it for my dog's skin condition, which he suspected was likely scabies just under the surface.  Sure enough, within weeks her itching had dropped by leaps instead of the baby steps every other product was offering.  The relief I felt at knowing she felt better made me feel better, too.  I live in Florida and the fleas are pretty much year round, and the mosquitos aren't much better.  Having protection from that pleases...