Hi, I have a 4 month old lovely black lab. She is sweet as anything 90% of the time. But today on our walk, on the way back she started jumping up trying to bite my clothes and growling. At one point she got a hold of my hand and She bit it so hard and wouldn’t let go that I have really deep puncture wounds on my hand. Normally she will walk to heel and walks really nicely on her lead, I don’t know why she did this. It’s really upset me as I’ve grown up with dogs and this has never happened before with any dogs I’ve had. To make it worse people were walking past and staring at me as I tried to control her but she just kept grabbing my clothes and biting me. I have bad social anxiety so this has really shaken me up. I don’t know if she was playing or being aggressive but she was not biting gently she was biting HARD. It’s made me a bit scared to take her on a walk incase she does it again. But as soon as we got home she was sweet as anything! I tried getting her to walk to heel with treats but she wasn’t having any of it, that’s when she took the opportunity to grab my hand I tried stoppping and waiting for her to calm down but she just grabbed my coat and started growling at me. I tried walking and just ignoring her but she just kept jumping and biting my sleeve. I don’t know what to do?? Help please !!