So I was told I was getting a black lab who was 4 months old at the time but as he gets bigger I'm concerned he may not be full lab. Sometimes he looks lab but other times he looks like a completely different dog. I have a 4 year old and cats ( who he may or may not be fond of. I can't tell as he is too excited for them and they hide. Sometimes he stands in a defensive position and just stares when he can't get to them. So this makes me nervous and isn't a characteristic for labs) in the house. Can anyone tell if he is or isn't full lab. And what type of dog he may be mixed with?