Farmers use working dogs on their farms to look out for mice and rats and herd sheep and cows. Police use dogs to catch bad guys and to help search for things or people. Some dogs are also used to aid the handicapped. A working dog must be smart and trainable. Working dogs must be able to follow instructions.
Some dogs go to a special school to learn their job.
My favorite working dog is a lab because they help handicapped people. This information was found in Encarta and on the Internet.