Regarding rituals and pets. Options

I have two cats, one of them doesn't like the rituals at all, if its the energies/whatever or the vibration of the words she doesn't like i don't know, but she makes sure to leave as soon as i begin.
The other doesn't care at all, she can strutt about, lay and watch me or even walk up and cuddle my leg.
Now, i was wondering if anyone had any ideas about implications or repurcussions about she entering my circle whenever she feels like it (Be it banish or invocation or whatever)

Cause & Effect?

Thank you. (IMG:style_emoticons/default/sweatdrop.gif)

Cats and dogs seem to be able to enter or leave a circle without putting a hole in it. Ouur HP has a cat and a dog. The dog alwauys joins ritual. We call him Hecate's Hound. He sits quietly in the east corner. Sometimes he adds energy to the ritual, and other times sucks it up, but not in large amounts. The cat tends to hide when we begin a ritual, but she is skittish at the best of times. It likely isn't the energy of the circle as much as the number of people in the rooms that freaks her out. Neither are a bother in any case.