Dogs are pretty seldom mean, I don't think I've ever seen one. What I have seen, is dogs with owners who don't know what to do with them, give them way too little activation, and have not trained them in any way. Many people often have a need to compensate other shortcomings with a big scary looking dog. Nothing wrong with that, if you are willing to put in the effort it takes to make them obedient and well behaved, but for many people it seems to be too much work.Dogs can be mean. I like some dogs and there are some that I hate. If a dog killed one of my animals I'm sure I would be very upset. Your own children are afraid of this dog and your husband still won't get rid of it? Dogs can be dangerous: Each year 4.7 million Americans are bitten by dogs and about 30 people are killed, Tell him the dog needs to go. I know it's not that simple but that's what I would do. So sad for your loss and for your situation.
Cats on the other hand, those can truly be evil. And horses like giving you a hard time just for the fun of it. These are just my opinions though.