You forgot one part of the CO loaws about not shooting prairie dogs. This is also take from DWO website:

"Question
Can I still hunt prairie dogs?
Answer
Land east of I-25 and a few select counties west of I-25 are closed to black-tailed prairie dog hunting (see the Small Game Regulations Brochure for a list of counties). The only exception is landowners or their agents who are shooting them for damage control. An “agent” is simply a person authorized by the landowner to act for him or her. "


http://wildlife.state.co.us/about/faq/

If you want to shoot prairie dogs, find private land. That is harder than it would seem to be on the surface.

I have found a place, but its really not open to anyone else.

What is funny is that I was worried that the landowner didn't want me killing all of the rats so that he could have some to shoot at. Silly me, I was told to kill them all. The landowner shoots at them but does it to kill them. He really doesn't do it to shoot at them. His only goal is that they stay on the other side of the fence in the county open space. Once they cross the fence line, they are fair game.

-Dana