Xen wrote: AFAIK the difference in personality is not all that significant, though.
The biggest characterdifference comes with the emphasis the breeder is using. If you go for the working line, chances are good that the breeder will use more active, work willing dogs to breed, while Showlinebreeders will use gentler dogs additional to their appearance. But you can get work-line appearance with gentle character and the other way around. Anything goes really.
This is just the general direction. 70% is down to training and the family.
That being said, it is nearly impossible to train them to be good guarding dogs or make them generally aggressive. That was nearly eliminated by breeding them to be gentle fluffballs filled with love


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