Hartz UltraGuard Pro Drops For Dogs Pro-cision-Flo Applicator - ease of application, reduces messiness, correct application to skin (not fur) resulting in increased effectiveness Three monthly treatments that effectively controls flea and tick infestations This formula kills and prevents adult fleas, ticks and mosquitoes, plus flea eggs and larvae thereby breaking the flea life cycle. This product also kills and repels the Deer tick, which may carry Lyme disease Contains both an insecticide to kill adult fleas, ticks and mosquitoes and an insect growth regulator (IGR) to kill flea eggs before they hatch For Dogs and Puppies (weighing 31-60 -pound)