Male dog on the gynecological chair

The master pulls the male dog Bronco into the room with the gynaecological chair and tells him to take a seat on it. The male dog resists a little, but after the straps are fastened, even the fidgeting doesn't help him any more. The master can calmly reach for the zipper and open it to take out the already half-stiff cock. He rubs it until the dog is only panting and whimpering, but nobody cares...