Sentry dog and attack dog - This dog is used to locate and subdue suspects or enemy, and to provide security for sensitive or controlled areas.
Search and rescue dog (SAR) - This dog is used to locate suspects or find missing people or objects. Bloodhounds are often used for this task.
Detection dog or explosive-sniffing dog - Some dogs are used to detect illicit substances such as drugs or explosives which may be carried on a person in their effects. In many countries, Beagles are used in airports to sniff the baggage for items that are not permitted; due to their friendly nature and appearance, the Beagle does not worry most passengers.[8]
Arson dogs - Some dogs are trained to pick up on traces of accelerants at sites of suspected arson.
Cadaver dogs - Some dogs are trained in detecting cadaverine and other odors of decomposing bodies. Dogs' noses are so sensitive that they are even capable of detecting bodies that are under running water[9] Pioneering work was done by Dr. Debra Komar (University of Alberta) in Association with the RCMP Civilian Search Dog Association[10] in this area. The result was the development of training techniques that resulted in near 100% accuracy rates.[11] Her research has been published in the Journal of Forensic Anthropology.