"Luna has always wanted to be a therapy dog at Therapy Dogs Worldwide. Now she's a whisker away from reaching her fifty-visit pin that will make it official. But when her "clients"--the children who visit her--are put into a therapy group, Luna's routine is upended. Like the moon, Luna shows different faces at different times. And her clients each have different needs--Beatrice is tangled in knots of anger, Caleb rushes like a waterfall, Amelia carries...

Seeing Jane's dog, Yum-Yum, help cheer up children in a cancer ward makes Zoe think about having her puppy, Sneakers, trained to do therapy, too, especially when Yum-Yum becomes very ill.