Your missing one key point. All the dogs were intact and the one that attacted was male and they had an in season female at the time as all this. So I am sorry but I disagree with you. This was 100% preventable in my opinion.

This person did a lot of mistakes. One major one is that one of the dogs was admittedly in season. THis will make both males and females more tempermental. THey will and can act more out of character then normal because of elevated hormones and responses to the dog in season. THey can get more aggresive, teritorial. Some get more loving and docile. Each dog is different. And because you don't know how the hormones will affect the dog a person with any dog in season and other dogs around it should be a lot more vigulant.

Next was if because of the dog that was in season the other dog already bit once, why was it not already contained or seperated from the children?

And last why is any dog allowed to play loose in a childs room? My dog is a German Shepherd. And they are all trained that they can only go into my childs room if I am there and then only to lay in the corner as we are doing things. Not jumping around or playing.

THis dog was already agitated because of the dog in season, his admittedly playing with the dog in the childs room increased it's excitement level.

I feel very badly for this man and his family but as far as I am concerned very little of this is the dogs fault. It was 100% preventable based on all the info that was in that article. If you are going to have intact dogs then you need to take responsibility for them. In a case like this one it was defiantely the owners responsibility not the dogs. A little common sense and this would not have happened. I know I sound harsh but this really bothers me.