Marilyn,
We had a Schnauzer like that, many years ago. However, she was about 25 lbs and DID hurt a lot when she bit. So, when we had our first granddaughter, we gave her up to a lady with no children. We just couldn't take the chance that she would bite the baby and since she was bigger, really hurt her.
I don't know why some dogs are like that, as you say, just genetic I guess.
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Gayle
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