In my experience all cats are like this. They all react in some individual way on the vibrations of meditation.
Some like some dislike certain practices.
Maybe it would be interesting to find out if there is any point where they stop running wild when you chant "Om".
Like in a sientific test series.
Once as i was on a meditative walk, doing the Vajrasattva-Mantra, i met a cat. It was on the hunt for a mouse... I just felt pitty for the mouse and stopped my walk, looking at the cat, chanting in my mind, thinking nothing special further.
The cat looked at me, stopped hunting, laid down and started to purr. This seemed to me quite fascinating and i kept standing there, chanting, waiting "When will this cat stop purring?"
We remained like this for many minutes - until i thought, i have to move along. When i started to leave the cat jumped off and ran away.