Food change…Re-homed pup refuses to eat new food after a week.

Hello! Long time lurker, first time poster. We re-homed a 1 year old terrier about a month ago. Sweet little dog, kids became attached instantly. Finally got him into the vet a couple of weeks ago. Appears fine and healthy. Vet suggested we change his food from a wet to dry..first week of change went great! He ate the new food no problem! Second week…he won’t touch it! Turns over his dish and ignores it! What gives? Any help truly appreciated!