What is a rhyming word pair for running dog?

This is a tricky one! There isn't a perfect rhyming pair for "running dog" because it's a compound phrase.

Here are some options depending on what you're aiming for:

* If you want a playful rhyme: "running frog" (this is a bit silly but might work in a humorous context)

* If you want a serious rhyme: You could use "running fog" if you want a sense of mystery or hiding.

Ultimately, the best rhyming word depends on the context of your sentence and the tone you're trying to create.