Reference: Annoca
I went to the bathroom - he thought I had gone to the bedroom and shot out of the livingroom - past the bathroom - down the hall and into the bedroom, found that I wasn't there and galloped back up the hall - past the bathroom again - and into the livingroom. When he couldn't find me he stood in the doorway and made a sort of yodeling noise!! I called him and he followed my voice and was very relieved to "find" me.
A yodelling dog! 
Your description of him dashing from room to room has reminded me of Verdell (the little dog in As Good As It Gets - also a griffon) checking out every room in Jack Nocholson's apartment when he gets shut in there alone for the first time
