I own a boxer called Ralph. I just got my new bike the other day and he wasnt happy wouldnt go near it. Although I was cycling up and down the street and he was following close behind.
He's useless in the heat tho. He goes threw more water than a steam train.
Very friendly, Great with kids, I'll have to report back on wether he's a good trail dog tho.
I would post a picture but god only knows how to do that.