We need help finding Diesel Dog!

HELP! THIS is Diesel Dog. He is my son's Diabetic Alert Dog and he disappeared this evening in Harrisonville around King Arthur's Court and Lexington. 

He lives on New Castle Dr and does not know his surroundings. He is wearing a gray harness with Harrisonville dog tags. 

My son needs this little fella so should you see him please call 816- 773-2499. Prayers please for his safe return😞