Activyl® Tick Plus for Dogs combines trusted, proven tick control with innovative flea control in the first monthly spot-on that uses bioactivation to kill fleas, and offers effective flea protection and tick control for your dog. Activyl® Tick Plus for Dogs works differently from conventional flea treatments. Using bioactivation, it only becomes fully active on contact with flea enzymes. Plus, it doesn’t just kill adult fleas; it also stops larvae from developing. By breaking the flea life cycle, you’re much more likely to resolve your dog’s problem for good. For use on DOGS only.