Our 10 month old American Bulldog Brutus has always sat in a chair like he is human. He has been doing this since the beginning. In this pic, which my oldest son took a few minutes ago, he is sitting on my back lanai just staring up at the clouds. He is a great dog and very affectionate, he loves everyone. He will lick your face off if you let him. He likes to put his arms around you and lick you while he hugs you, it is incredibly funny.