My younger golden retriever (2 yrs) suddenly went after my older golden (~7 yrs), drawing blood.

As stated in the title, my 2-year-old golden retriever (Honey, first photo) suddenly became extremely aggressive toward my 7-year-old golden (Oliver, second photo) with no apparent trigger. She was playing with a toy that she had pushed under the couch and Oliver was sitting across the room when she suddenly got up and charged him. Before we could pull them apart, blood was drawn from Oliver’s eye and front paw. We are taking Oliver to the vet right now to get him checked on. Thankfully, I don’t think his eye itself was gotten badly enough to cause serious concern. After it was over she seemed extremely upset and immediately wanted to check on Oliver, who appeared to want to make sure she was okay just as badly. I’m no expert, so this is just what it looked like to me.

We got Honey 18 months ago from an extremely abusive family with large pit bulls who were very aggressive; this was not apparent to us until a tooth dislodged itself from inside her leg multiple months after we got her, along with behaviors seemingly indicating anxiety (particularly around men, it took her quite a while to feel safe around me; she still doesn’t like when I wear hats). She is incredibly sweet and loving, and always wants to be around Oliver. The only things we have to correct her on are her desperation for food in all forms and occasionally trying to bump the TV with her nose when she sees animals on it. Whenever Honey appears to be anxious, this is shown with fear/fleeing and not aggression.

I’m almost certain that something made her feel the way she did at her previous home and caused this. If anyone has any kind of advice for avoiding this kind of thing in the future, I would be extremely grateful.