My son is 2. I've been helping "pet nice" since the day I brought him home from the hospital and he's good for the most part, but he's still a toddler and has his toddler moments. Anytime he gets rough with a cat - he has smacked them, pulled tails or ears, and pulled fur - he gets a firm "no" and an immediate trip to time out. Incidents are rare. My cats don't help, though - they let him do whatever he wants and don't care.