There are two dog related parts that I can think of. Agitator dogs are
little cams that give ratchetiing action to the agitator auger. Or, a
wig-wag, so called because it moves back and forth, is an
electro-magnet that operates spin and agitation action in older belt
drive models. I can't imagine that either would cause your breaker to
flip. You could have a breaker problem. Have you considered that?