I don't think that your dog understands it so don't have make it a big deal. comfort him though as much as you can. there are some dogs that have a very good memory. The sudden change in behavior may be due change of atmosphere inside the house.
I know my dog does. And the answer is "Yes". I have no doubt that they do remember a lot, but, as with humans, the mechanism is very poorly understood. As a puppy my dog had been beaten with a broom. For the rest of his life if you pick up a broom he'd freak out. I'm sure he remembered his abuse.
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