Wood Dog Houses

I recently got two very lovely cedar wood dog houses for my black Lab and black and white mix. My Lab "Haley" was a puppy when I got him but my mix "Momo" was already a precocious adolescent when he came to my home.
My relationship with Momo has always been slightly distant and although we love each other, there has never been that extreme closeness that a dog and its owner can share. On the other hand Haley and I are inseparable. He is a very intelligent dog and trains easily.
Now the problem that I have is that when Haley came to our household (as a puppy) Momo was already full grown. He took Haley under his wing and treated him well. At that time I only had one wood dog house and not two. As Haley began to grow I knew that it was only a matter of time before I would need to buy a second cedar wood doghouse. When Haley became an adolescent I knew that I could wait no longer. So I bought the dogs new cedar wood dog houses. They both are happy with their houses and both before and now generally get along well. However as Haley has been going through full blown puberty and is now entering the age when he will be fully sexually mature Momo is getting more aggressive with him. Momo has always made sure that Haley understands that he is the top dog in our house but since Haley has become more sexually mature I think that Momo sees him as more of a threat. Now Momo is very aggressive with Haley whenever Haley tries to play with him or other dogs. I hope that this phase passes quickly as it is hard for me to see Momo being such a boss with Haley but I also understand that the two dogs are going to have to work this stuff out for themselves.