I have a ten year old cat and a 1 1/2 year old french bulldog. from my own experience, there was some jealousy when he was a puppy, and they did not have anything to do with each other. now, after about a year, they get along. don't expect them to be best of friends. also, depending on your cat's personality, that could be a big issue. my cat is a rescue and was with both dogs and cats in an open environment. if it is a "hide under the bed cat" your results may vary.