Dogs may get filariasis if bitten by mosquitoes, because dog heartworms use mosquitoes, fleas, etc. as intermediate hosts. When the intermediate host is infected and sucks blood from the dog, the heartworm larvae escape from the beak and burrow into the end. It enters the skin of the host dog and circulates to the heart and blood vessels through the subcutaneous lymph or blood circulation system. Dog heartworm disease, also known as heartworm disease, is caused by adult worms of the heartworm heartworm parasitic in the right ventricle and pulmonary artery of dogs, causing damage to the circulatory, respiratory and urinary systems of sick dogs. Parasitic nematodes that occur.