Our cat is schizo, usually very lovable but when outdoors he likes to play with full on claws and teeth sinking in deep, the only cat we've owned that behaves like that. He did it again earlier today, I threw some stones at it and chased it around the house. After I cleaned up the bloody cuts and gashes I went outside and typical butter wouldn't melt in his mouth!!
I've gotten close a few times to having him put down, amazing how lovable he is, even gently bites your nose (kisses). If he ever harmed any of my grandchildren though that would definitely be his last time, then it's a final trip to the vet!!