we go on eastern Oregon prairie dog(sage rat) trips all the time. Occasionally running into a coyote here and there. Fort Rock/Christmas Valley area is where you need to go. It's seasonal though, and not sure where we are at right now but basically you can only shoot them at the time of the year when the grass is low or non-existant...otherwise you can't see them
At first we will drive up to a farmers house and ask for permission if it looks safe and reasonable to do. Luckily, I found contacts through my family who has some friends out there that give us permission ahead of time so I have a few hot spots for myself now but before that I would just go out and find my own spots...people do it all the time out there. You will see a truck pulled off the road with 2 fellas using the roof of the cab as a rest and move field to field.
I hear the rats/dogs are abundant in Klamath Falls area but I never looked for them while I was over there