Seeing all three of them came from the shelter, and are a lot better then they were when we first got them, I think they would be safe.

They'd be scared, but safe.
Nala would probably do best. We haven't had any aggression towards people or other dogs (unless food is involved w/ other dogs) with her.

Kiara would be scared out of her mind. She can't stand to be away from me, but then again she's gotten a lot used to new people than she was when we got her. It doesn't take her nearly as long to get used to someone as it did when we first got her.

Simba is the only one I would worry about. Maybe i'm just paranoid because of his past (he used to be really bad) and I know i'm silly for feeling that way. He's extremely changed over the years and has a lot more tolerence towards other people and dogs... infact, it's usually him I think is going to have a problem with something and he turns out to be completely fine with it!