near the bottom of the article. I am guessing what they mean is "they're thick so you cant train them"

( sleepybinky, Thu 4 Jun 2009, 12:08, archived)

Ahhh, I was being blind.
They are notoriously stubborn and bolshy, he's one of very few to break one in.
( Esme Weatherwax I swear on my tash it's daycent hash, Thu 4 Jun 2009, 12:10, archived)

THEY DONT HAVE BRAINS.
this makes them useful animals in zombie attacks.
( sleepybinky, Thu 4 Jun 2009, 12:11, archived)