NexGard for dogs kills adult fleas before they lay eggs and kills ticks, too. All in a delicious, soft chew that dogs love. NexGard contains an ingredient, afoxolaner that helps treat and control fleas and ticks and keeps killing for a full 30 days. IMPORTANT SAFETY INFORMATION: NexGard is for use in dogs only The most frequently reported adverse reactions include vomiting, dry/flaky skin, diarrhoea, lethargy, and lack of appetite The safe use of NexGard in pregnant, breeding or lactating dogs has not been evaluated Use with caution in dogs with a history of seizures