Well, the dog is a police dog. He was under the supervision and control of the police department. That makes him an "employee," such that the county running the police force can be held liable under the doctrine of respondeat superior for the conduct of the dog, provided it was in the course and scope oh his employment. Thus, if he can get a judgment against the dog, he can hold the county responsible, too. It is likely that the county would have insurance that covers the liability of its employees. So, he probably can try to force the insurance company to satisfy the judgment through a proceeding supplemental. Ain't the law fun?