Even if the dog is fine with you, aggressive dogs are a nightmare for anyone who might come in contact with them. Your parents, significant other, vets, groomers, boarders, house sitters… you only know how the dog acts around others when you’re there, and when you’re not there it might be a totally different story. What if you’re not home, how will your parents manage an aggressive dog? You put him in a crate, but what if he breaks out and begins to terrorize “intruders” (such as your parent’s invited guests, or the maintenance guy)? It sounds like a ridiculous hypothetical scenario but it’s happened to someone I know. It’s not a situation I would want to put anyone in, especially not my loved ones.