Dance: FOOD! She loves to play and she'll work her butt off for a ball, but she is food obsessed. And also, she fixates on a ball and does everything in slow motion, so that doesn't work too well for training, haha. When she does something awesome she gets a whole handful of food and a ball toss, though. That works.
Ripley: Food for learning new things, tug for rewarding things already known. I tend to use a mixture of both when working with him as he works well for either, but I can't use a toy for teaching him something new because he can't think properly when a favourite toy is involved and it takes twice as long to get anywhere.
Keira: Food. She doesn't care about toys. I wish she did, because I hate giving her food (she nearly takes my hand with it in excitement).