Longsighted doesn't mean you can see a long way. It means you can't focus on things close up. It's the wrong description here. Human eyes, given good health or a decent pair of specs, are just as capable of focusing to infinity as a dog's or a pair of binoculars or the Hubble telescope. Like our eyes, and unlike the bins or telescope, they can't magnify. They lack the acuity of vision of human eyes as the macula is absent. Of course, their eyesight in adapted to hunting in tandem with their other senses, but their eyes are not superior to ours in any way, and are inferior in some respects. Poor colour vision, poor acuity...they're just good for the job in hand. That job does not include shitting all over the place and biting kids in festivals, etc.