Judy,
Congrats! How cool is that? first, Gizmo is sooo beautiful! I was actually thinking of trying that with Dillon. I talked to someone in one of my obedience classes who has collies and a farm with sheep and she does herding instinct testing and herding training. I havent done it yet, but really think i want to see if Dillon likes it.
My concern with Dillon is his facination with other animals poop...example, I took him to a huge field with about 75-100 canadian geese just hanging out, figured, i would let him loose and see what happened, maybe he would chase, maybe he would herd them or at least show some interest in the birds...he walked about 10 steps towards this huge flock and looked down and said " ooo ooo, look, Goose POOP!"

I grabbed him quick before any eating or rolling commenced...but see I wonder if he would be interested in the sheep or their poop....a poop herder ?

sigh - I still may try it out with him and see.... I loved your photos it really looked like a fun time.
Emilie