We have just gotten a 9 week old lab. My 3 year old is understandably nervous around him when he's excited /playful but tonight, my daughter and I were cuddling on the sofa and he came and started barking very aggressively towards both of us and tried jumping and snapping on us, especially towards my daughter. He didn't seem to be playing - was really aggressive. He's not like this all of the time and I'm not sure whether to ignore to correct this behaviour. If I correct , what do I do?
