He's got a vet appointment on Thursday, which will hopefully result in him being neutered if there's no reason (such as heartworms) that they can't do the surgery. At his age, I don't hold out a lot of hope that it will change his marking behavior, however. I've been following him around the house with a bucket and rags cleaning up after him. At least the other boys haven't felt the need to compete with him.
Maya and I took him on another 5 miler today, so I'm hoping for a good night's sleep. He only stayed in the crate the first night and he only stayed downstairs in the kitchen the second night. Last night he broke the baby gate and came upstairs and slept right outside the bedroom door. He obviously wants to be part of the pack.