Sentry PRO XFT 61 Flea & Tick Squeeze-On kills fleas in as little as 1 hr and ticks in as little as 3 hrs. It not only stops adult fleas from biting, but it also protects your dog from flea eggs and larvae for up to 9 weeks. Plus, you can bathe your pet 24 hrs after you apply this squeeze-on. Each package provides 3 months of protection for your dog.