I forgot to add something.
My 2 older cats are 6 and 5 years old I got them as kittens before I got my dog. They have never liked my dog. They swat at him or make a mad meow if he gets too close to them.
My 2 younger cats are 3 and 1 years old, I also got them as kittens but they came after my dog. They are best friends with my dog. They lay with him and play with him.
I think you have a better chance at them getting along if you go with a kitten that will be raised with your dog.
Sinister "The Prince of Darkness" 4 yr old black male GSD 3.11.09
Draco "Dakota's Unbreakable Vow" 5.5 mth old male Dalmatian 6.30.13
Cats: Chaos, Mayhem, Monster, Wicked