Anyone use horse fly spray on their V? The horse & deer flies, especially deer, are horrible this year! It's particularly bad on our morning outing with little breeze. I know Atlast & Manna Pro specifically mention being safe for dogs; however, I wanted to try a Pyrethrin/permethrin based one such as Bugblock. Those chemicals are most effective against biting flies; however, I am sensitive to using chemicals if it's not necessary. The aformentioned ones are used in many flea/tick treatments, and my understanding is very young pups & cats are the most sensitive. Any thoughts or suggestions? Thanks!