Just now reading this thread.....I was so sad when I saw that you were taking him back...and SO relieved to see that you decided to keep him. Jax is adorable!!!! He actually may not be a mix....not all yorkies look the same! And even if he is..so what..he is precious. My first yorkie was a mix and she was the most awesome pup in the world!
I had her for 15 years .. she was estimated to be 2 when I got her from a shelter.
I wish you that much time or more with Jax and so many many happy moments with him. I am thinking Toby and Jax are going to have a blast growing up together!