Some dogs don't eat when they feel stressed, but I agree if 2 days go by and he's literally not eating anything (even a handful at a time is acceptable to me and you mentioned he is doing that) then I would take him to the vet and get him checked out for peace of mind.
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 5 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010