what is the best way to introduce a puppy and a cat (who has grown up with dogs)?

Never just put a puppy down and let it decide what to do. Even a cat that is great with dogs won't want to be leaped all over and chewed like a toy. Puppy should be on leash so the cat can control how close he wants to come. Also make sure the cat always has an "escape route" if he decides he wants to leave. And keep in mind that a senior cat might not have the tolerance he did when he was younger.

So let the cat determine most of the interaction. If he runs away or hisses a lot, you'll need a slower start. Good info here: http://www.americanhumane.org/animals/adoption-pet...

Verrry carefully. Dogs are prey animals, cats are prey, need I say more?

Constant supervision, separate/contain when you can''t, immediate correction when caught in the act, there will be no guarantees, if it doesn't work out re-home the pup.

And if it's a terrier and/or a terrier mix, don't get it, as they're genetically inclined to kill small mammals, including cats, and it can't be trained out.

I say let the puppy loose to discover her new house, and the cat will meet her on its own terms. They will cross paths eventually, and there will be hissing. But it all works out in this type of situation.