Thanks for adding this in here Helen. I have heard and read of this study before. I am under the impression that cats can be quite healing. However, if someone has an aversion to cats or an allergy to cats, they can be quite anxiety provoking. Let me speak to that aversion for a minute.
Part of the reason we suffer in life is because we are unaware of how we react to discomfort day to day. Usually we act with aversion to it because we don't want to feel any pain. However, part of our work here to create more peace in our lives is to be able to notice when we're experiencing pain, discomfort, or distress on the physical/emotional levels and to not react in the same old ways we have been.
So if someone does have an aversion to cats, this may be a perfect place to practice. See if you can notice how this discomfort shows up physically, bring attention to the actual sensation. Know that this sensation is impermanent and there isn't a need to react with this aversion which only increases our angst in the end. See if you can realize this discomfort comes and goes and be open to what the cat may bring as far as things you find pleasant (e.g., look, feel of the fur, sound of the purr).
Thoughts on this?