Thank you Diana.  Yes, I understand the range of emotions when you work at a vet clinic.  We went over yesterday to pick up his ashes and got a chance to pet some puppies while we received the condolences of the staff there.  They also sent us a paw imprint which we received yesterday as well.  Made me realize just how big SunnyD was -- his paw was as big as my hand.  But, of course, it all brought back our sadness that he was no longer with us.  
He was a very good dog.  And the best canine model I've ever had.  The other 4 are doing their best to fill those huge paw prints.  And they will.  It will just take a little while.  
Thanks again for your sympathy.  It's very much appreciated.
Jim