Originally Posted by Cybrarian
Comfortis is an internal med. I live in the "fleas never hibernate state of Florida". I give our beagle/rat terrier mixes one pill for their weight every 6 wks and we never have fleas.
I live in Indiana and have 3 inside dog and one 110 # dog that is outside most of the time. I give them Comfortis and am not bothered with fleas at all. I even let my outside dog in the house when it is real hot or cold. It is certainly worth the cost.