Jackfrost - here is something to think about - as long as someone wants the dog it is not a castoff or useless.
Maybe my comment was a little harsh, I don't think any dog is useless. I do however think there is a huge difference between a working GSD and your average dog.

I dont know why you would think a color makes the dog bad
Color doesn't make them bad

but then at the same time if you have two colored parents with the recessive gene you are probably going to get a litter with at least one white puppy in it....simple genetics.
and simple genetics and observation would tell you that after about 30 years of breeding gsd's White's no longer showed up in the litters. This would show that the recessive gene was very rare in the GSD population at that time. Your odds of getting two recessive parents together was very rare, and by responsible breeders studying bloodlines and pedigrees would have a pretty good guess as how to avoid breeding to those dogs because white was not desired. Since that time, you've had a small gene pool being used for at least the past 70 years.

As long as you arent inbreeding and you get some hybrid vigor in you arent going to have any different problems that the colored dogs.
If you're studying genetics you might want to go over hybrid vigor again, this has nothing to do with it. But if you wanted to add some "new" blood, no responsible breeder of GSD's is going to allow their brood bitch or proven stud to breed with a white coat. So chances are you're going to be adding more unproven bloodlines.



There are big problems with the GSD especially in america. Their showlines go back to basically two dogs brought over from Germany, but somehow I"m supposed to believe White's have a large gene pool?? They had to get those white's consistently somehow, How do you think that happened? you're into genetics, think about it.

I dont know if this helps any for showing that these dogs work, but I am pretty sure this is a WGSD (Berger Blanc Suisse) that worked as a herding do during the summers in Switzerland....
I'm sure there are some that can work, but it's not very often. It's a consistency thing, and I still love when white breeder's claim they can do everything a "regular" GSD can do, yet have no cert's or titles to show, other than CGC, TT, TDI, etc, sorry, those are fun to do, but are a far cry from being proven as working stock.