I agree crossbreeding could be fatal to any breed, but my carefully chosing the dog and temprament and gentics a little of new blood can be a good thing.
As the bloodlines on these breeds are so small we could end up inbreeding at some point and creating problems.
So a little of something new is a good thing, even mother nature shows us that, to create the dog in the first place you had to have a wolf and a GSD, and if she had not wanted them mixed then they would not of mated...
So carefull selection like mother nature is a good thing..
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