Check your reflection for
any stray pieces of food, loose threads, or lint.
There you are, swimming desperately away from enormous organisms that are trying to eat you, when you gobble up
a stray piece of food just in the nick of time to trigger a growth spurt.
The twist is that you not only want the dog not to eat
stray piece of food, but that you also must train that it's O.K. to eat under certain circumstances.