thanks, for the nice replies =)

Rhi, Gonzo is doing really well! He still has chasing issues (it has progressed to where he will occasionally see the dog in the lane next to them, and he'll just be diverted and run off-course, but he won't chase the dog )... I don't know when/how/if we'll break that! He has lots of fun with it, though. By now his swimmer's turn is awesome and he's so so fast, it's just the occasional chasing. His first "fun run" is June 3rd, it's a demo at a dog fair. Thanks!

Alyssa, they're being good boys for the most part. Gonzo is still snarky when the puppy is trying to jump on him, but they're both getting better. I caught them playing a few times