Based on that, I'd think you'll be fine with a 3-9x.

Most of my shots when calling have been as NT has already suggested - less than 100 yards. I had one come within about 25 feet while I watched another come in from a different direction. Had the scoped dialed up high from watching the distant dog, couldn't find the close dog fast enough, so he got away. Generally, I start a set with the scope at the lowest power, dialing it up once I spot a coyote.