Abandoning someone or something is one of the cruelest things that can be done in any social setting, whether it be among humans, dogs, wolves, or monkeys. It is the grandest and most primal fear that there is, and it causes a fear of death. Being abandoned is the same as being left to perish. If your family or your pack leaves you behind, it is a clear sign that you are a useless piece of shite. You got hit because there were other things that were more important. You did not meet the requirements.
This causes a great deal of suffering. You are never going to get this out of your head. I am a dog. All have done to dogs have be done to me.