Glad you are ok! You are not being unreasonable at all. It is hard to get rid of a pet but it would be awful if the dog injured you, your wife or even a stranger.
There is a recent dog mauling story that had been in the news off and on lately and I can't get it out of my head. It is so horrible I won't repeat so none of you have it in your head!
Yes! get rid of the dog.