I guess I'm the only one suggesting that both parties are a bit to blame. Auntie is wacko for bringing another dog to a house that already has visiting canines but most dog owners believe that their dogs are not violent.
I admit it - I have a violent dog - he's an aged chihuahua-mix who bites anyone who comes to our door. Luckily he no longer has any teeth to do any damage (remember - he's old). With the immediate family he is the sweetest dog ever. He's our baby and spoiled rotten.
He replaced another chihuahua who was once accused of biting our neighbor's toddler. True, she came over to show her kids the bunnies in the backyard without asking us off and on. Whenever I saw her coming I put Andrew in the house - he HATED little kids. One day I didn't move quite fast enough and Andrew nipped at him. I looked but there wasn't even a red mark. I was shocked when a week or so later the sheriff knocked at our door to investigate a dog attack. She claimed that she had to take her child to the doctor for an infected dogbite.
Luckily, all the shots were up to date and I told the sheriff that I had a problem with her just 'dropping' by to play with our animals. The attack supposedly happened that day mentioned above so I knew it wasn't our dog. I told him that they had just bought the kids a pitbull puppy and she had complained that his teeth were like needles. If anything bit her baby, it was that puppy. They just didn't want to have it on record.
Because of that experience we no longer allow our dogs around strange people or animals. If someone brings a dog over to the house, ours are put up. Things can happen and they happen fast. It is better to be safe than sorry.