If flies are targeting a specific area on your dog, say his ears, try applying petroleum jelly to the area to keep them from biting. You can also consider at-home, pet-safe repellants, like a mixture of apple cider vinegar and water or lemon and water, or any number of over-the-counter insect repellants that are as safe for your dog as they are for you. Just be sure to talk to your vet before pursuing any of these remedies, either homemade or store-bought. Home Maintenance Tips for Fighting ...