Our expert says:
I would suggest you do not allow your pup to chase the cats as when she is a bigger dog, she could do some damage.
The best is to cause a startle responce, in other words, you should take a bunch of keys, water pistol with citronella oil in or a tin with coins or stones in and throw them at the dog. The most important thing is for her to not see the "discipline" coming from you. In her mind she should start putting 2 and 2 together and realise that each time she chases the cats the keys fall from the sky and "bite" her. This is very important because if she sees it coming from you, then she will only chase the cats when you are not around. This works really well as I have done it with my own dog.
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