The Dwarf had been watching him during all this the same way he might have watched a three-headed dog.

It was the three-headed dog that threw me.

"What can you tell me about Cerberus the three-headed dog?"

A three-headed dog guarded the entrance, but it backed away from her and they passed through.

Once I had a patient who resented the way people on the street would stop and pet his three-headed purple dog.

She could explain away a three-headed dog easier than dealing with this.

Just stay out of one corridor on the right, which leads to death, and away from the three-headed dog, which guards we know not what.

He had ascertained that the hard way when he faced the three-headed dog eight years ago.

Cerberus, he now remembered, was the three-headed dog who guarded the gates to Hell.

There really was a three-headed dog up ahead!