Kiara will not want to be second. She does not have the personaility to be above other dogs, and if in the case it does happen, I will sort it out as it's my responsibility as the owner to do so.

You may WANT Tikeya to be alpha, but by the sounds of it Baby should be, no matter who came first.

From what you said..
Baby was being pestered by Oscar, which Baby was telling him to knock it off and Tikeya butted in. Baby had TWO dogs who were challenging her in some way or another. (Whether or not it looked like it.)


Taking in a large breed dog you've got to expect something like this, especially with another female dog, who's already stuck in her ways. Tikeya is used to being alpha, Baby wants to be alpha. As the owner you've got to sort it out. It sounds like Baby has more of a strive to be alpha than Tikeya does, so you've got to make Tikeya understand this. If something isn't done, their behavior is just going to worsen, and treating Tikeya like royalty and Baby like scum isn't going to help the situation.