The field of animal law is in its infancy and prosecutors are frequently at a loss to handle cases of animal abuse and neglect.
The American Prosecutors Research Institute has published an excellent resource manual, Animal Cruelty Prosecution: Opportunities for Early Response to Crime and Interpersonal Violence. Written by Dr. Randall Lockwood and produced jointly by the American Society for the Prevention of Cruelty to Animals and the Office of Juvenile Justice and Delinquency Prevention, the book discusses why cruelty cases are important, types of cases, prosecuting procedures and reference materials.
The book is available as a free download. Thanks to Dr. Charlotte Robinson for passing the information along.