Hi ,a kitten was s old to me loaded with fleas now my Maltese and mi-ki have them. I bought Zodiac flea and tick controller I put it on all three, 2 days ago and I see they are still scratching I called my vet and he recommended ACTIVYL I called Merck and thy said I could use it even though I had used the Zodiac The problem is it's only sold by vet's I couldn't find one vet that carried it, My vet had one for my kitten but none for my dogs and you can't use cats on dogs -can't find it on line.as I said only sold by vet's.The vet said I could use Revolution but the one with out tick control? ANY SOLUTIONS PLEASE?????