Hi, I live in ny and I let my Dog silk

run in my "Fenced

IN" Back Yard in the Every morning from 6:45a to 7a in the morning he uses the bathroom and romp out there with my Cat and they both are let back in the house to have breakfast before I go to work ... This is 'AN EVERYDAY" routine ..... This morning I let my doggie Silk out as usually and when I went to let him in he was not there .. He usually waits right by the door for me to let him in (NO I DONT HAVE A DOGGIE DOOR.. But he is great about it .. I called him and then after 5min of waiting I went out to the Yard and no silk ??? I looked in the neighbors yard no silk ... it is now 6:26p and Silk is still not here .. he is microchiped and has a collar on ... What should I do

?? I love my dog so much

??? He is a great dog ??? I walked around my building looking for him ? he is 9months old well trained and is sooo nice .. I am very upset

.. if you can give me any advice please do ... it welcommed ..