there any examples of un-training guinea pigs?

A:

What your guinea pig is showing out is called conditioned behavior.
An experiment with chicken: Two cages of chickens had a similar food automatic device. The automat gave a grain of food when a chicken pecked a button next to the automat. In cage A the automat gave the prize every time the button was pecked. In cage B the automat, with no pattern, sometimes gave a prize and sometimes it did not. In both cages the chickens quickly learned to use the automatic to get the prize; the grain of food. That's conditioning with food.
The interesting part (considering your question) is what happened when the experiment had been going on for a length of time and then the automat was turned Off.Plaintiff-Appellee

v.

RAFAEL VASQUEZ GARCIA, also known as Rafael Garcia-Vasquez, also known
as Rafael Garcia Velasques, also known as Rafael Vasquez-Garcia, also known
as Rafael Garcia, also known as Rafael Velasquez Garcia,

                                                  Defendant-Appellant


                   Appeal from the United States District Court
                        for the