To be fair, dogs do lick their own wounds and will totally lick yours if you let them. I'm generously choosing to assume this is because they want to help, instead of surreptitiously trying to find out what your interiors taste like. But while dog saliva does have certain antibacterial properties, and some people totally let dogs lick their wounds because of this, I'd like to offer a counterpoint: Holy screaming s**tnozzles, please don't ever do that. Your dog was also just licking his crusty sack.
Sure, you might be fine. Then again, you might also get meningitis. Or acute renal failure. Or a nasty-ass infection that requires several surgical interventions. Or you might just straight-up die.
What I'm saying is: Invest in Bactine. At least that way you can be sure your first-aid kit hasn't just spent 15 minutes gargling poop before making contact with your bloodstream.