There is an entire subset of dogs that are more picky - they may like food one day, but not the next. The typical picky dog may rotate through many different types of food or toppers in order to keep things interesting. Personally I have seen more picky Chihuahua’s, finicky Huskies, selective Shi Tzus, fussy Yorkies and choosy Doodles than any other breeds. However the truly picky dog can be rather rare - most picky pups actually have other reasons why they might not want to eat.