Nexgard Flav Chew Dog M 4-10kg 3pips (Blue)Nexgard Flav Chew Dog M 4 10kg 3Pips (Blue) Take these beef flavored Chewables for the treatment and prevention of flea and tick infestations. Nexgard Chewables kill Lone Star ticks, Black legged ticks, American dog ticks and Brown dog ticks all month long. NexGard contains the ingredient afoxolaner which also targets and kills adult fleas before they can lay eggs.