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When you start the game at the very beginning you are given the choice to play as one of two human characters: Scarlet (the woman) or Walter (the man). The one you play as is the one you control, so it's the one you can pick up pets with. The other person acts as your "helper." So both are in the story through out the game, but you control one of them.

Scarlet is faster than Walter to begin with, but Walter keeps pets happier. So most people find Walter easier to pass the levels with.

The other name you mentioned is Flo's dog. He only comes in once per level (with Flo). He's sort of like the Celebrity in Diner Dash Hometown Hero--when he's near other pets, they cheer up a little. So if you have two bath stations and he's in one, the pet in the other one will get a little happier. I didn't find that very useful in terms of strategy, but it's just something to know.