Keep supervising the visits between them both - but don't force the issue. Let each find out where they are in the pecking order of the home and it will all work out. The only way it may not is if your pup really doesn't like cats. I know that my boys would have a hard time with a cat - just because some of the ferel cats in the area have teased them through the front window. Generally they can all get along very well - just give it time!