“it has worked on my dogs for years...I recently made the mistake of not refilling their prescriptions and trying the store bought frontline liquid and the captsar pills....oh boy did I regret that because I've been fighting a flea infestation even though I shaved them short, sprayed the yard with the insect and flea killer, flea baths, the frontline liquid, the capstar pills, washed everything in my house, vaccumed, sprayed all the furniture with the flea killer, you name it I did it...I'm going back to trifexis and never making that mistake again! whew!”