[Quiet Man Cometh]

Depends on how they are raised I guess, and whether or not the dog percieves the cat as a prey animal of sorts or something to chase. My family has always had both types of animals around so all our dogs and cats have to be interspecies friendly or things get difficult fast. Monty wasn't raised with cats, but he didn't at all bothered by Friday, but that may have been because Friday lives with two dogs (and she runs things ;)) so she didn't run when he walked up. My sister's old mastiff didn't chase cats at all until one (someone's barn cat) actually ran from him. He was a puppy and then tried to chase the cats he lived who would just glare at him and go back so sleep, so he never made a habit out of it.