This morning Middle Son was once again very interested in Jack, the small dog.
I asked if he wanted to pet Jack, and he signed yes. My girlfriend picked Jack up and held him, so that Middle could pet him.
He came over and touched Jack. At first he was very hesitant, just barely making contact with Jack before pulling away. After a few touches he was a little more confident.
It reminded me of the way Middle used to react to dogs when we would walk around the neighborhood before we got his service dog. He was always interested in the dogs, but very hesitant. When the opportunity presented, he would pet a dog that was securely held by its owner. I think because he knew that the dog couldn't make any sudden moves, which scared him.