I don't think any soda is an adequate substitute for Dr. Pepper, but at least it's not Root Beer. You would not believe how many times I've been offered Root Beer because a restaurant doesn't have Dr. Pepper. I mean, how is that even close? Because it's not Coke and it's brown? That's like being offered a green bicycle instead of a green jeep. "But they're both green", would never be a good enough answer.
(verb) to serve Mr. Pibb in lieu of Dr. Pepper, or to erroneously believe Mr. Pibb to be an adequate substitute for Dr. Pepper"
Or just one, he's not that big
You can't turn dogs evil
If a dog bites you, bite it back