Hi!
We have a 3 yr old boxer (male)He was about a yr old when I had my twin boys.
He is the best dog. We have the twins and a 12 yr old boy, he lets the twins tug on his ears, tail, ride him like a horse, whatever they want, when he's had enough of them, he just goes into his area with his bed,that the boys cant get to. I have never, ever worried about him getting agressive. He seems to love being around the kids. They feed him food and are even around him with food and he is as gentle as can be.
He's about 65-70lbs, so sometimes when we are outside in the backyard and he's running around, we have to watch the boys closely to make sure he doesnt knock them over accidentally, because he does get pretty excited, but never has he ever tried to harm them in any way.
He's even tolerant of our 2 cats! I hope this helps, if you have any other questions about him, feel free to contact me!