Our pug back in the day was impossible to train, especially to stop barking or pissing and shitting indoors, marking bedposts, and so on. Once she (yes, a she was lifting her leg and marking the bed) jumped up on the dining room table when we were out, and couldn't get down. When we got home and walked in the door she pissed all over it.
She also once are an entire value-sized bag of M&Ms. Trembled uncontrollably for a few hours but ended up fine. To tell the truth I don't think the family would have minded if she hadn't.