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4. No donuts for these canine cops

Police dogs, also referred to as K-9 dogs, undergo vigorous training that allows them to assist police officers in tracking, protection, search and rescue, and drug work.

Due to their highly sensitive sense of smell, police dogs have played significant parts in some of the country's biggest drug busts, have sniffed out deadly bombs, and are used in search missions, such as those that took place after the World Trade Center bombings in 2001.

Because of their speed, police dogs are able to apprehend and catch criminals that police officers aren't able to.