Meet Alanna

The only child of some good friends of ours.

She is a bright child.

Here she is, dressed up specially for a short while. She decided she would do this to scare her dogs!
Amazingly, she was absolutely correct - the dogs went berserk!

She had a great time revealing herself to them.

They calmed down.

And when she tried to repeat her trick, they didn't fall for it again!

What does this incident tell you about her, and her dogs? Any "D"s or "S" among them?