The remaining possibility is that food cravings develop due to the consistent association of certain foods with particular stimuli or social contexts (special occasions). (idmprogram.com)
Once a dog has passed his Socialization Period (see Your Puppy's Development) it does not matter that a dog has not had a negative experience with particular stimuli. (ultimatepuppy.com)
That's just how your body and mind are responding to a particular stimulus. (entrepreneur.com)