I'm looking in my home remedies for dogs it's a really a good book it gives you alot of info on many things anyway in this book it suggets

apply a thin layer of aloe vera 2x daily

or
Hydrocortisone cream a thin layer again use one with 0.5 percent hydrocortisone 2x daily also

And it also says you can put skin so soft on the dog to repell flies, mosquitoes, fleas and others it recommends mixing about 1/4 capful in a quart of water then put in spray bottle and give him a spritz weekly,
If you use more then that you'll end up with a greasy pet

I'm going to try that skin so soft not only will it help with the bugs it will make tham smell really good

Hope this helps