Thanks everybody! I have discovered he doesn't like to have keys shaken in front of his nose... it's just I don't always have keys handy! Maybe I can find some old ones that don't go to anything and use that.

It never ceases to amaze me how different each dog is. Zenith was stubborn - it was partly a breed characteristic, and partly because she didn't have the proper socialization early on (she was 4 months old when we got her and we had to work really hard). Belle was easy. Sampson is a trial but he seems to be pretty bright - already fusses to get out of the crate when he has to go pee. But everything is Playtime to him.

Ah, kids. Always an adventure. When I have time I will put some pictures of him on my website. :-)