Why cats chase lasers?
Cats chase laser dots because it is something shiny and moving, which triggers their hunting/pouncing instincts. It's a game to them that keeps them mentally and physically in shape.
Dogs chasing cats is a stereotype, but they will chase cats and other things if they are excited! It also depends on territorial issues as well. If the cat had already claimed the territory, then the dog may chase it to try and get that territory, or if the dog had claimed it first, then it may chase the cat to get it off said territory.
Not all dogs chase cats, but there are several reasons why a dog would chase a cat. Cats that are let outside usually roam, as they have quite large territories. Dogs, that perceive the house they live in as their territory, might chase off a cat if the dog feels like its territory is being threatened. Some dogs have a higher "chase" drive than others, and will just chase animals smaller than themselves for no…