[Harmless Teddy Bear]

Mine was a nice safe dog as long as you did not try to get into our yard or raise your hand to me. Then she growled and bit. If you then retreated she would not chase you. She was only interested in drive you off.

There was a (sort of) exception and that was when a male dog went into her yard when she had pups. That dog she killed.

[Altariel]

Most likely, the male dog would have attacked the puppies had she not attacked him. It must not have been very intelligent to stick around when it saw an angry mother dog charging at it.