Black curly cloud

This is Shadow. My kuya's shadow. When he first came to our home as a pup that was lalamoved during midnight, he would never leave my kuya's side. He would cry and whine whenever my kuya would leave to go to work, and even paw at the door of our bathroom when he's inside. Recently, he's grown a bit and we still have no clear idea what sort of breed he is (if you have an idea, please comment it). He eats a lot but he remains slim. He has a bed but he prefers to sleep on the floor next to my kuya's table (like in the picture). Very playful and energetic. Sometimes he even teases our other dogs!