My Westie takes Comfortis but the vet said that Lucy was too small. I do not give her flea medication in the winter (but I live in a cold state). When spring comes, we'll transition back to the Interceptor or the Sentinel (both are for heartworm but one has flea protection too and I can't remember which one)
Both seem to work ~ I've never seen any fleas on either dog and they are outside a lot in the warmer months.
__________________  Mommy to Lucy, Ringo, and Matthew |