Prairie dogs are a protected species in Sask. The only place you’ll find them here is in Grassland National park. Go to Montana or Wyoming if you want a good P-dog shoot.
If gophers are of interest, come out to the Tompkins/Piapot/Maple Creek area in June and knock on some doors. Most farmers will be happy to see you, some may even throw you a brick of ammo for helping out.
Are you in Canada? Last couple years , the numbers are way down from a few years ago, I have never really understood 223 for a gopher, but than I shot some very good 22 rimfires.
Gophers are totally different thing from P.D. They seem to run in cycles, not from shooting, but weather, food, disease is the bid one, I think.