Activyl is a liquid spot on treatment similar in application to Frontline- it soaks into their skin, it is still a nasty chemical but none of the dogs showed any adverse effects (my Ziva is usually very sensitive to stuff ,throws up heartworm meds, bad reaction to vacines) Everyone around here uses frontline, maybe that's why the fleas are resistent to it, my neighbor is using frontline for her cats and it is not controlling the problem. |