FRONTLINE TRI-ACT® has a unique formula that kills faster and repels more disease-carrying parasites than the next leading competitor brand. Used every 4 weeks, it’s the next level in parasite control for dogs, providing long-lasting protection against flying insects as well as fleas and ticks, while also preventing home flea infestations. FRONTLINE TRI-ACT® FOR DOGS helps to keep your dog active, healthy and happy by working against a range of common UK parasites that can transmit diseases or cause irritation to your dog.