This Pro Flea & Tick Treatment for Dogs and Puppies 2,5 to 6kg kills fleas, ticks and reduces biting by mosquitoes for up to 30 days. -Prevents flea eggs. -This unique patent pending Pro-Glide applicator easily penetrates fur for application directly to your dog's skin.-Hartz is a trusted flea and tick brand and has been providing flea and tick solutions for pets for over 50 years.