Old dog new cat, need some tips on how to introduce them successfully

[u/TheDavidb420]

The dog is 11 year old black Labrador, fairly well settled but still has a puppy like curiosity. The cat is fairly new to us, about a week, mature enough to have had a litter of kittens (before we ended up taking her in). She has gone for him once or twice, once or twice he likes to sniff near her and she’s swiped at him. Trying to get them used to each other but looking for tips; can’t keep them separately, don’t want to give the cat up. What can we do?