Dogs must test negative for heartworms before ... It may take several weeks before all the fleas are gone. Both NexGard and Frontline kill fleas at all life stages, plus ticks.
NexGard: NexGard Products for Fleas, Ticks, and Heartworms in Dogs and Cats Simparica: Simparica Products for Fleas, Ticks, & Heartworms in Dogs ...
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