Tango works for toys/play, and praise. She couldn't care less about food. She likes food (the only food she'll work for is boiled chicken), but she's more inclined to work harder if she knows there is going to be a toy at the end or lots of praise.

The others lives revolve around food and will work very well for both food and/or praise. Toys are alright to them. They're the complete opposite of Tango minus the praise aspect.