Every breed of dog we have today came from other breeds. Mixing and experimenting is the history they all share.
This “Whitemaraner” is a good example of what can happen when you mix breeds. The dog shown here is a mix of a Weimaraner and a German Shorthair Pointer. Craig Koshyk is calling it a Whitemaraner over on his Pointind Dog blog. Check out this post and this one, too, to find out more about this dog.