Ive got a boxer (ellie), she is the 5 this year. Never bit or attacked anything. When people are around my daughter, ellie always makes sure she is by her side.
Protective over her without a doubt.

My old boxer (buster), was the same. Only bit once. He was 8 and he bit my mate when he tried to take a sausage off the bbq i was doing! Only nipped him.

My mum has a boxer (max), he is 4. Nips most of the time when you go to open a door. Think he has anxiety of being left alone. Does become quite aggresive when being put in his bed at night. He was locked up by previous owners.

I'd agree with "8 year old walking the dog may not be strong enough for the dog."