White vinegar can kill some fleas on dogs, but it is not recommended to use white vinegar because white vinegar has a strong smell and dogs have a very sensitive sense of smell. Using white vinegar can cause nose sensitivity in dogs and cause sneezing. , owners can use other items to kill fleas on their dogs. For example: buy external insect repellent, bathe your dog frequently, use a fine-toothed comb to comb your dog's hair, etc.