Every afternoon on the trail by my house, a neighbor rides his bike and has his Great Dane next to him the entire way -- the dane is BARELY trotting and is equal in height to the bike. Funny to see -- I've watched the Dane grow up out on the trail, and the poor man obviously can't exercise him enough any other way. He is SO well behaved -- heals exactly next to him all the way. He's on leash but likely doesn't need it.

So NOT like my dog! I did try once -- 10 yards, straight back home with a skinned knee. Never again!