But I'm not sure this falls under 'complex language' as greatguy put it. Speaking of cats, cat and dogs can supposedly see ghosts. Of course we know that cats are hunters and more focused on movement than we are, but dogs, who can see at least parcial color are scavangers like us, so there's not much reason to assume their vision would be better, actually, I think it's pretty much been proven not to be.
I don't think most animals "see" ghosts. If ghosts exist, animals most likely sense them with whatever sense is greatest in the animals. Example: Cats have excellent vision, especially at night, so they would most likely see a ghost at night. Dogs, as you said, have poor vision (compared to humans) but have incredible hearing and smell. Perhaps they can detect ghosts with these stronger senses. Humans, and even advanced human equipment, can't compare with raw animal abilities.
I would love to see an experiment where several animals are put in a haunted, ghost inhabitied area, and see how they react. Not including animals that we have seen react to these kinds of phenomenom, like dogs, cats, and horses. These animals would do well, (or poorly) depending on which sense detects ghosts the best.
Turkey Vulture: Best sense of smell in animal kingdom
Bats: echolocation
Birds of prey: Best vision in animal kingdom
Elephants: Decent eyesight, extreme hearing and smelling abilities. + great intelligence
Rhino: Poor eyesight, excellent hearing
Sharks: electromagnetic sensory
Dolphins and whales: echolocation + extreme intelligence
Rattlesnake: Heat sensory.
Ladybug: weather prediction and temperature sensing
Owls: Best hearing.
Archerfish: Doudle lensed vision
Or maybe animals are just more tuned into their environment and sublte changes that a ghost would make. Its not like someone could actually put this test together. Imagine a dolphin tank in a haunted house.