I just want to say thanks to all of you for your kind words - I can't believe how many people have written something, it really has helped especially while I've been sat here at work.
When I started this thread late last night I was so upset, soon after I began thinking perhaps I shouldn't have - why should these guys really care.
But I'm glad I did.
I'm still drifting between feeling OK and moments of despair. I can't believe he's never coming home. We do have another dog who is 3 months older that Tyler, and he's incredibly sad at the moment. He's not even interested in us but prefers to sit on his own.