Carmen, I will take a look at those links when I'm on my computer later. The tracking drives helps explain Dax's CONSTANT sniffing of everything. I've never had a dog that just goes to town with his nose the way he does.
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Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus CAX, CGC, ETD, HCT, RATI, RATN, TC 3/18/2013
Zena GSD 6/1/03
Riley GSD/BC 1/10/05-2/1/2013