My dog killed a baby racoon--rabies?

We were walking our dog through the woods earlier tonight and he ran after a raccoon and killed it, we later saw that it was a baby, or maybe a "teen" raccoon or whatever. We looked but we couldn't find any bite or scratch marks on him, but regardless, and I'm pretty ashamed to admit it, he hasn't had a rabbies shot in the 6 months we've had him. how concerned do I need to be about rabbies? And are the odds of him having it lessened because the raccoon was young? I love this dog to death, best dog i've ever had, and I'm terrified of putting him to sleep, don't think I could do it.... but I'm also pregnant and really worried about what this could mean to me and the baby if he does have it & goes crazy, or somehow transfers saliva, etc. Help?