Trifexis, also known as Comfortis PLUS Chewable Tablets for Dogs, are a meat flavoured tablet that rapidly kills fleas on dogs, prevents heartworm disease and treats roundworm, hookworm and whipworm in dogs and puppies. Trifexis (Comfortis PLUS) starts to kill fleas within 30 minutes of administration and then goes on to prevent flea infestations for a further month. The chewable meat flavored tablet is readily accepted by dogs and as the product is an oral medication there are no restrictions with regards to swimming or washing after treatment. Trifexis (Comfortis PLUS) comes in 5 convenient sizes for dogs between 5 and 120 lbs in weight. Comfortis PLUS is registered for the control of flea allergy dermatitis in dogs. In the US this product is known as Trifexis, outside of the USA it is known as Comfortis PLUS. Please note the product you will receive will be branded Comfortis PLUS.