Binro the Heretic We had a boxer mix who would make similar sounds when she wanted to go out or wanted a bite of what you were eating.
My mom would scowl and say, "Don't you use that tone with me, young lady!" and the dog would slouch and become the very embodiment of the term "hang-dog look". Sometimes, her performance would be rewarded with a doggy treat.
She was a sweet and good dog.
MacGyver Style Bomb Had a black lab/doberman that would do the same thing. Shoo him away from the table and he would lay down in the corner with a loud groan.
dairyqueenlatifah My dachshund does this when you won't let him get up on the bed with you.