Dark Waters (The Last Dogs Series #2)

When canine heroes Max, Rocky, and Gizmo encounter a lavish riverboat moored close to shore, they're wary of what they might find on board. But as they're welcomed by a friendly community of dogs, the trio discover that there's more to their new world than they expected. These dogs have seen humans -- who Max, Rocky, and Gizmo thought had disappeared without a trace.
The brave companions meet new friends and encounter old enemies in their search for their people, traveling to places they nev...