I found two greenies hidden under a rug we seldom move the other day...
Stella doesn't even notice when I put Revolution on her. I usually do it when she's napping or just waking up so she isn't moving around a lot, but it dries really quick (under 30 seconds...lots of alcohol in it!) so I wouldn't be worried as long as you're getting it on the skin and not just on the hair. Maybe just try to hold him for a couple minutes afterwards just to be sure? Or while he's sleeping or deeply involved with attacking a favorite bully stick or something?