This is what our vet told us many moons ago, when we use to go camping with Max. Go talk to a pharmicist & see what they have in repelent for children/babies & u can use that on ur dog, as long as its non-toxic, if ur dogs a licker.. But Max isn't a licker so we used the same stuff as we used. EXCEPT we put it where he couldn't lick it if he wanted to. Like on his shoulders, tail (he hates touching his tail), the front of his neck, & on his belly (mostly on his belly), his belly has no fur on it. So what we do is:
1. I grab a cloth & gently hold his, ummm u know
2. dad sprays all over is belly, & inside of legs
3. I grab my dino boxers
4. I put my boxers on him & is tail goes out the fly.
Max has worn boxers for such a long time, he never takes them off & if they're falling off him he'll come over & whine, until u pull up his boxers.

hehehe