A 4-12x is an excellent range for hunting coyotes. I would think that you would call them in closer than 400yds though. As far as P-dogs go, I agree that a 6-24x would probably the best choice. I have never hunted P-dogs, so I am just trying to make an educated guess considering the smaller target and all. I use a 4-12x for my predator calling rig and it has performed great.