Tony, if you want to do SchH, buy a dog from a SchH background, i.e., at least one parent, three out of four grandparents and six out of eight great-grandparents titled to SCH3. Otherwise you're setting yourself and the dog up for a whole lot of headaches and heartaches.
If you're not sure about your commitment to SchH, then buy a good dog from a breeding in which the parents have working titles, SchH, AKC, whatever, in addition to show ratings or CH's.
And remember, there are no guarantees for working ability. Over the years, I've owned three puppies out of SCH3 sires and SCH1 dams whose grandparents were all SCH3. One of them developed HD, the other two washed out in SchH - one was too hectic to do the protection work or the tracking, the other had no interest in protection - she went into avoidance.
Don't place too many expectations on a puppy,
Liz
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