Just got one of those myself. I call him the little four legged black and tan land shark or Maxwell for short.
LOL!
I assume your Land Shark is a pup?
He’ll grow out of it, somewhat.
Dobermanns are very “mouthy” and express their affection by taking your hand/arm/whatever in their mouth and gently holding it.
With needle-like puppy teeth, it’s not so much fun.
:)
When I leave the house, I say ‘Bye” to the dogs and tell Odin to “take care of the house and the girls” and as I shut the door, I reach in to him and he always ‘mouths’ my hand goodbye.
When I come back home, it’s the first thing he does when I come in the door...I think it’s kinda universal like “Aloha” to them, or something...;D