Hartz flea and tick control for canines comparison poster was edited by internationally recognized veterinary parasitologist, Dr. Jorge Guerrero, this 25"x16" wall chart features "Commonly used EPA-Registered Canine Spot-on Flea and Tick Control Products." (Products listed are NOT for use on cats.) The chart represents the most commonly used EPA-regulated canine flea and tick drop agents as of May 1, 2010.