Hippobosca longipennis (Diptera: Hippoboscidae), the dog fly, louse fly, or blind fly, is an obligate blood-feeding parasite of wild carnivores. Its bites can be painful and result in skin irritation, it is an intermediate host for the canine and hyaenid filarial parasite Dipetalonema dracunculoides, and it may also be a biological or mechanical vector for other pathogens.