Jojo, the Hero

What's wrong with Jojo? Leo's normally well-behaved dog keeps barking at her schoolmate Nina when they are wandering the forest together for a geocaching project. When Nina suddenly faints, it is thanks to Jojo's barking, Leo finds her quickly enough. Nina has recently been diagnosed with diabetes and Jojo seems to have the rare gift of being able to sniff a critical drop in her blood sugar level. Jojo is a diabetic warning dog and therefore exactly what Nina desperately needs. Is Leo ready to take the big step of giving up her dog?