Okay, I have a cat who is going to be one years old on the seventeenth of October. Crookshanks, my cat, has a bad habit of biting and scratching my brother and I! She's usually a really good cat. If I'm petting her and she doesn't want to be pet anymore she'll gently nip my hand and I'll stop, but there are times when she just bites and scratches my brother and I out of nowhere! We say no very firmly to her and then we'll walk away and leave her alone, but sometimes she follows us and attacks us nonetheless.
What can I do?
What can I do?