Both. Depending on the dog and cat, dogs can chase cats, but some feisty or territorial cats are more than capable in chasing away a dog.
All dogs chase cats.
they actually like to chase mice
Dogs will chase things that run, that is instinct.
Dogs sometimes chase after cats because it is their nature. They are descendants of wolves. But, the cat will protect itself and might scratch the dog. Sometimes the cat will fight back and it might not end well for the dog.
no, dogs just chase just bout anything that moves
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 other reason than to chase it. These reasons do not mean that dogs hate cats. Dogs and cats living in the same household are often very friendly towards each other.
The same reason they chase cats and squirrels and mice. Dogs are predators. Predators chase things to kill and eat.
dogs chase cats around because they are two different types of animals!
Actually, most dogs don't. Out of the dogs that I've been through (2) they haven't chased one of our cats. If the dog cats irritated by the cat, it might chase it. Otherwise, the dog and cat can become pretty good friends.
dogs don't eat cats. they chase cats.
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.