When I introduced my dog to my cat it was a long enough process. We kept the dog on a leash for the first initial meet but then after that the cat hid for a while. She would come out when he was in his cage. We just let the animals feel each other out...took a week or so but then they were fine together. The dog no longer needs to be in his cage. Now they are the best of friends.

Give them time to get used to each other.