Wahey! Look who finally came to the Dark Side! Friend me back, you goober.

Sorry LJ ate your comment. It's not all bad, I promise you. Now you can join all my Snarry communities and we can commiserate about the awful, awful writing.

In my opinion you got all the answers right (though #1 has valid arguments for either, if that's what you're referring to). A run-thru is a two-sided kennel for larger dogs (or sometimes multi-dog families) with one side for sleeping, a dog-sized hole in the wall, and the other side for eating.