I have a Siberian that does the same thing.  She will eat her food but only as a last resort.  I would also limit his rawhide / cookie intake that could be the reason he's not eating his dog food.  He's not a big dog.  I would add a little scrambled egg, or rice, or anything that perhaps you are eating to his bowl.  normally dogs like to eat when you eat so that might work for him too.  Get really small bite food too,  that might help.  Mine eat science diet and I just found one that has small bites which helped me since I have two smaller dogs (bichon and Yorkie mix).  Sometimes just adding something to their bowl gets them interested.