NEVER underestimate what a determined canine can do!
Our three pooches are generally fairly well-behaved in the house... but we have had more than one instance of one of them going nuts while we're out and tearing into something for apparently no reason. Or maybe it WAS a spider after all. Hmmmm. But we love then too much to ever get truly mad at them.
Here's a pic of one of them. I call him Bennie the Brain-Damaged. His formal name is Sir Benjamin Poopsalot. He was a rescue dog that they found when he was only about 6 weeks old, starving and infested with maggots. He has serious OCD and anxiety... but he's absolutely the sweetest dog I've ever seen. Definitely NOT an Alpha Dog... he always just wants to be with his pack.