Will Falconer, DVM Moderator
Hey Sherry,
If this guy was over 4 mo. old when he got his last vaccinations, odds are very high he's immune for life. If you want to check, you can ask your vet to titer test for parvo, distemper, and rabies. But, here's a page to check to be sure you don't make the all too common interpretation mistake around titers.