Thanks, everyone! I'm really proud of Buckley. It's impossible to convey how good a dog he's been since he joined our family.
Buckley is the first dog I've had since age ten (40+ years ago!), so for all intents and purposes, he's the first for whom I've been fully responsible. Despite my inexperience with formal training, and the various little mistakes that I've made along the way, Buckley has behaved beautifully in a variety of situations and circumstances that more than make up for his occasional slip-ups (usually with a bit of contributory negligence on my part!).
Thanks, again, to everyone on the forum for sharing their knowledge. It's played a big part in the modest success we've enjoyed thus far.