Advice, Please

Something very bad happened last night. I bit Mom. She was sitting on the floor, in between Tom & I eating popcorn. All of the sudden, I lunged across her lap to snap at Tom but instead of nipping Tom, I nipped her arm and then kept lunging at Tom and he kept growling and fighting me right back. Mom is still sitting on the floor, in the middle of all this, screaming for Dad to help break us up.

She wasn't bleeding but now she has a nasty looking bruise. What is most painful is how hurt she feels inside. This is the first time she has seen me lunge at anything. That's what scares her now. What if I lunged at someone else like a neighbor or a little kid? Am I going to lash out like this again? Will it be worse? What is Mom doing wrong that made sweet Huck become violent and mean like that? Mom thought Tom and I were doing great and we had a peaceful 2 dog house. Am I jealous? Am I not getting enough attention?

Mom feels like she can't trust me now.

Has anyone else experienced this? She feels embarrassed, like she is a bad dog-mom. She feels like she needs that Cesar guy to come over to our house and tell her that she is an irresponsible dog-mom and caused me to morph into an unstable, neurotic dog.

Please share any advice you may have. Mom's obviously emotional and trying to process it all right now.

This is what Mom's arm looks like.