I had a neighbor who rescued a huge Great Pyrenees. The dog was easily over 200lbs, but clearly had some mental problems. She'd stand in the corner of the house and bark into the walls for hours on end. Sometimes she was playful, sometimes not.

Anyways, their other dog somehow got out of the fence. It was a toy-sized dog, not sure of the breed. So I picked her up and was walking her to the front door. Jenna, the Great Pyrenees, had other ideas. She charged up to me, put her nose right against my abs and starts barking as loud as she can. As I'm slowly backing out, she keeps doing this, seemingly barking louder. My ears were ringing and I was scared shitless. She walked through the electric fence and followed me to my front door.