Thanks for the compliments, everyone! I'm sure that Rusty will appreciate them once he learns to sit at the computer and read.
Rusty is definitely oversized; he was by far the largest pup in his litter. The size difference between him and the runt of the litter was striking! He was about twice as heavy and tall at 9 weeks. C'est la vie, his larger size will help him compete with all of the border collies in agility!