Wow Jackie! Great question! Let's see here....

I would say that might girls would have to be like mood rings - the colors would vary a lot. But overall this is what I think:

Lexi - She would be purple. She is fun, loving, sweet, strong (alpha dog) and can be vivacious and exciting.

Sasha - I would say blue.... she is mellow but can be very hyper and just crazy! She is the baby of the family even though she is 5 or so. She is always being picked on my Maddie and Lexi. She is just a nice even keeled and extremely sweet dog - Pink would fit her too.

Maddie - She is a myriad of colors... but RED, BRIGHT BRIGHT BRIGHT RED is her identity. She is a maniac, hyper, goofy and she can be fun and loving and sweet when she wants to be. Yellow would also fit her.