In this fable, the peripetera is occurs when the dog, who already has a piece of meat in her jaws, sees her reflection while crossing a bridge. Upon seeing the reflection, she saw another dog with a piece of meat and, not being satisfied with what she already had, tried to take the food from her own reflection, which ultimately resulted to her losing the piece of meat she had in the first place.
The anagnorisis occurs when the dog recognizes that she was fooled by her own reflection, and realizes that she is left with nothing.
The dogs pathos is the loss of the meat she had in the first place, because of the mistake she made.