Really.  Only the best of dogs would put up with me asking him to jump over the same two branches six or seven times.  All for an action shot. Honestly, if anyone had asked me to do something that inane, I would not have put up with it.  But he did it, again and again, just because I asked him.  
Is this the best dog in the world or what?

Look at the concentration on his face, the effort he's putting himself through, all for his owner.  *sniff*  It's enough to bring a tear to one's eye it is.  Sure, he'll never be one of those lean, quick and muscled police dogs;  he'll never be more than an overly-pampered housepet.

I wouldn't change a single thing about him though, not for the Littlest Hobo, Rin Tin Tin or the most decorated dog in any service.  He'll always just be my Diefenbaker.