No matter how well trained, a dog, like a human, can attack without provocation.
Now, which dog is a bigger threat to me and my kids when we're riding our bikes?
Coco the merciless, or an 80lb Rottie, Pit Bull, Etc.
I think the stat will tell you the most common dog to bite is a cocker spanial.
We're not talking frequency here. We're talking the damage an animal can do.
I'm sure White Tigers are very trainable and intelligent, but there is a reason you do not keep an animal with such power as a pet.
Ask Roy Horn. He'll tell you.