Be careful with your Giant. If Chief thinks that your aunt is getting you upset, he may try and get between you and your aunt. At that point be sure to calm him down and let him know that he doesn't need to interfere, otherwise he will.
Also, watch the interaction between Chief and your aunt very closely for a few days. If she is aggresive with him you MUST tell her that its inappropriate and tell your parents. Because his history is murky, you do not know how he will react to new situations and new people. Also, if your aunt doesn't like dogs, dogs trying to brush themselves along her legs, doesn't like petting dogs, doesn't like having a dog touch her with a wet nose, doesn't liek being licked, or doesn't like being followed by a big black dog, you need to have that conversation early on. Chief will do all those things, as you probably know by now.
Hope all goes well.
Also, watch the interaction between Chief and your aunt very closely for a few days. If she is aggresive with him you MUST tell her that its inappropriate and tell your parents. Because his history is murky, you do not know how he will react to new situations and new people. Also, if your aunt doesn't like dogs, dogs trying to brush themselves along her legs, doesn't like petting dogs, doesn't like having a dog touch her with a wet nose, doesn't liek being licked, or doesn't like being followed by a big black dog, you need to have that conversation early on. Chief will do all those things, as you probably know by now.
Hope all goes well.