Wow, that's a bad situation. Obviously, I would not bring such a dog. I wouldn't stay at that party with kids either. I don't mean to be morbid, but as much as I love dogs, there are bad ones that need to be watched and I will not be around a bad dog without a solid knife on my belt. The knife serves two purposes. The dog will sense my confidence to defend myself and will not attack me, and if the dog goes after someone else, I can stop him if necessary.