I just recently became aware that there was a controversy (minor to be sure) about whether or not dogs can look up. Silly. Of course they can look up. Who asked that question anyway? Obviously someone who doesn't know beans about dogs.
But there is a kernel of interest in the question. It may have originated in the observation that dogs seldom look up, and some may never do it at all. I have always felt that looking up was a sign of intelligence in a dog. It's also a matter of expectation: A squirrel dog relies on his nose but he also uses his eyes to scan limbs. The picture above is Jack watching some blackbirds fly over him. Murphy, my gone-but-not-forgotten Rottie, used to watch contrails.
Of course, he was the contemplative sort and would have snorted in derision if any of the clueless had asked him "Do you dogs ever look up?"