I am sorry to hear that you had to make such a tough decision, but glad to hear you did what you felt was best for Tyson. I am glad that you will get to see him a few times before you move. Do you think you could set up some play dates for Thor and Tyson at Tyson's new home, so that Thor will get an idea as to where Tyson is now? (That is what we did for Ginger when her friends moved a couple of miles away - she caught on pretty quick.)