guineapiggy, if you have mosquitoes in your area then it's a really good idea to use it. Heartworm treatment once the pet is infected is really expensive and has a high mortality rate. We always recommend it even for indoor-only pets, because mosquitoes can definitely get inside a house.

I give Jasper Heartgard. The vet I work for told me that from what he has seen he doesn't feel that Revolution is very effective for dogs, so there went my idea for an all-in-one treatment for Jasper. I think the demand is high enough that Revolution will try to reformulate a more effective dog formula soon though.

I do not have him on flea prevention. I've only ever once found a flea on him (and with his sparse fur it was EASY to spot) and when that happened I gave him a capstar to kill any lurkers. I've considered Advantage or the like...if I find a flea again I probably will put him on it.