Emily Rodda's Teen Power Inc. 

The Bad Dog Mystery

Jock is a very naughty dog. Probably the worst, most badly-behaved dog Richelle has ever met. She doesn't want to walk him with the rest of the Teen Power gang. She has enough problems already. Her mother's lost jade ring for one. And the robber who's breaking into houses all over Raven Hill for another.

Richelle would love to see the last of Joke. But when it looks as though he is doomed to be put down, she finds herself involved in a crazy desperate plan to save him.

What a shame Jock can't help her in return.
Or can he?

Another great story in the exciting series starring the Teen Power gang.