really the only thing you need a purebred dog for is dog shows. Beyond that, long as you register properly, you're dog can participate. Just depends on where you are and what rules they have for that event and area.
The more people I meet and talk to,the more I love my dogs and their intelligence.
Shasta GSD 5/5/10 CGC
"Dax" Thor z vom Weberhaus 3/18/2013
Zena GSD 6/1/03
Riley GSD/BC 1/10/05-2/1/2013