Proper introduction as well will help with the transition of introducing them to each other. The first week or so have them in separate rooms and don't let them see each other. Take a towel and rub one towel on the dog and another towel on the cat, then bring the towels to the other animal so they will smell and know that theres another animal in the house but won't be able to see it.

Then GRADUALLY start introducing them to each other for short periods at a time. Five minutes a day a few times maybe. ALWAYS have the dog on a leash, and do not leave them unsupervised.

Keep doing this gradually elongating the time they are in each others' company until they get used to the other animal.

KBlaix is right though, its not the cat that needs to get used to the dog, but rather the dog used to the cat. After a few swipes to the nose the dog will learn quickly enough to leave the cat to do her own thing!