I have always loved dogs, and jerked off the neighbourhood dogs when l was young.
When I got older I got a German shepard/ labrador mix that i also played around with.
Unfortunately he was a beta dog, and did not dare to mount his alpha (me).
He was huge. Both in body and cock.
His back was well above my knee, and he weighed around 55-60 kg.
I jerked and sucked him off several times a week, but I could never get him to mount me.
Tried to insert his hard cock in my ass, but there was no trusting and knotting.
Now I have a bitch, that loves to lick.