Personally, I'd go for a scope with a low power of 1X. We hunt with dogs (long legged Walkers) in some thick stuff here in N.C. They push the deer hard and when that buck comes out he ain't goofing off and you'd better not be either. I can get on an animal running hell bent for leather with a 1X scope quicker than I can look below my scope, line up the back sight, front sight and animal.
Just put the crosshairs on him, squeeze. Help catch the dogs (if you can!)