I think they do see things we often don't. Have seen my cats doing much the same, seeming to follow something that isn't there. I used to think it was just the catnip. But then saw someone else's cats doing it to. Once during a meditation I was aware of fairies near me. When I opened my eyes cats where following something unseen where I had sensed the fairies.
As far as knowing when you trip, definitely. I believe we emit energy and frequency, and are affected by others' energy etc. I have heard that animals (particularly cats and horses) are very sensitive to this energy.
I suspect if we take something that alters our consciousness, it also alters our energy, and they could pick up on this, and even have it affect them - almost as if they had taken it with you.
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