Exterminators using hound to sniff out bed bugs in Windsor, Ont.

Exterminators are turning to a bug-hunting canine named Mack afterbed bugs were reported in a library system in southwestern Ontario.

The Essex County Library system, which serves several rural municipalities surrounding Windsor, closed temporarily after bed bugs were found in five locations.

• Bed bugs close 14 branches of Essex County Library
• Several Essex County libraries to reopen after bed bug scare

Mack and his trainer are both certified to hunt bugs. Using his sense of smell, Mack seeks out the bugs' unique scent. When he finds them, he raises his paw and then scratches at the area until he's given a treat. After a quick break, he's back to work, going through the entire library.

Searching theLaSalle branch onThursday, Mack found a few spots where the pesky insects were living.

Exterminators will be taking care of for those bugs and officials expect all 14 branches of the library to reopen Friday.

Any books found to have bed bugs living inside them will immediately be sealed in plastic bags for three weeks to kill off the bugs and eggs.

The library says bed bugs are not a public health concern and are classified as a 'nuisance' by public health officials.