If the vet says there's no underlying cause for the attraction, score the rind of an unpeeled lemon with a sharp knife, slice, & then simmer on medium heat for at least an hour. After it cools, put it in a spray bottle & spritz the dog, lifting the coat as you go. I never met a fly or flea that enjoyed lemon oil.
Why is your dog exposed to so many flies? You must take your fur-baby to the veterinarian for an exam. There could be an underlying infection going on under the skin. There are many products that are available for flies. Please bring you baby in the house to help him ease his pain. Being bit can be very painful and cause infection.
Have you considered asking your Veterinarian to recommend one of the numerous brands of spray/ointments for flies?
There is a special kind of spray you can get I'm sure. I know their is a fly spray that is used for horses. It'll probably work for dogs too.
Add your voice to the conversation. Click here to answer this question.