Eventually Cananine fructiform disorder (often brought on by overdose of plantains, bananas, and related fruits) can lead to just such a pass. Typically, however, there is an intermediate stage in which the dog undergoes a drastic change in their morphology. If your dog should begin to look like the picture below, please discontinue feeding it bananas and switch it to a diet rich in trendiness, such as sushi.
<img src="http://www.mastinodellanoce.it/foto-basset/Banana-05.JPG">