Agree. This is not about excusing away his behaviour but instead about how to cope with it. Get some in real life help. Look after your own needs and self first. If this behaviour isn't acceptable to you then you must react accordingly - which might ultimately be to put it behind you by walking away.

In my own opinion, this dog situation is symbolic of a larger problem. I want to validate then your query and obvious underlying feelings that this is all so very wrong. Find some help and advocate for yourself. Even your doctor is a good place to start making a plan.