He's a rescue so little to no information on him, three different breed/age guesses from the vets at the shelter he was adopted from ranging from hound -> lab -> great dane and 6-9 months. My guess is he's mostly great dane because of his bone structure and disposition, but the tail is a source of mystery. When I got him in late May, he was 37 lbs at 20ish inches (last picture), and now he weighs almost 80. Take your best guess