I have 2 cats right now and maybe in years to come I would like to get a dog, also.
I guess if you have the cats and dogs at a very early age, they will grow up together, but once the cats get into adulthood, it makes it difficult for them adapt to living with a dog.
That's what I have found with the older cats, the ginger one was only young when we got the puppy, but our cats were outside cats anyway.
KaHn