I have experienced loose stool on all of my cats occassionally. This stopped when I changed their diet to an all raw diet.
Can I ask what you are feeding your cats?
If there are more changes in behavior, I would take them to the vet, but don't worry too much.
Sincerely,
Captain Cattings...
Keep a spray bottle nearby when eating. You must do something about this behavior if he becomes so frenzied that he is no longer careful about not harming you/your child. Start off by telling him sharply no and pushing his nose lightly away. If the kitty continues or gets more aggressive...
