It took a few weeks, but Duncan and Donut finally took a nap together side by side. I was so stoked when this happened yesterday. They've definitely bonded with one another, with Donut taking a protective, motherly role with her baby brother.
In other pet news, the little guy has more than doubled in size since we got him, and our vet thinks he will end up being in the 60-70 pound range when he's fully grown. If he ends up even bigger than that, I won't even complain. I'll just need to make sure he is trained to walk on leash without pulling though, so he doesn't drag my wife and mother-in-law all over the place on walks. That would be bad, IMO.
The little guy is also proving himself to be a very quick learner of new commands, most likely because he has Donut to learn from. At only 11 weeks, he already knows Sit, Down, Speak, Off, Come, No, and is working on Dance, Wait and Shake. He is also doing really well with off leash training, which I never thought I would be doing with such a young puppy. The more time goes on, the more I'm amazed with his progress.
If this keeps up, once he's fixed and better trained, I think we will begin training him and his sister to become service animals. With how outgoing the both of them are with new people/children, I think they would really enjoy bringing smiles to people in nursing homes and hospitals.