How would 2 cats get on with a dog?

When introducing a new cat/dog into a home with a cat/dog keep the new animal in a separate, closed off room for a few days until it adjusts to it's new environment. Then keep both animals on a leash, and let them meet. A vet told me if introducing a cat into a home with a dog, to put the dog in it's crate and let the cat walk around it.