My 5 month old english bulldog chases, hops around, barks and tries to play with my 16 and 15 year old cranky, female cats. They want nothing to do with her and I don't blame them at that age. What can I do to get her to act normal with them? I strongly discourage the chasing and yell "no" with the hand clap, but she just doesn't seem to get the idea that it's wrong all the time. She's not trying to be vicious just playful, but I don't want to drive the cats nuts. I just want her to get used to them being there without it being a huge deal. Any suggestions?