Once A Month, Simply Squeeze Revolution Out And Onto The Skin Just In Front Of Your Cat Or Dogs Shoulder Blades. Two Hours Later, Your Pet Will Receive Protection Against Fleas (Including Their Eggs And Larvae), Heartworm, And Other Parasites For The Next 30 Days. No Pills To Mash Into Your Pets Food. No Sticky Sprays. No More Juggling Lots Of Different Products. In The Event You Bathe Your Pet Two Hours After Applying Revolution, Rest Assured Knowing Revolution Will Be Unaffected, Remaining Completely Effective.