According to the Wallstreet Journal, The City of New York Health Department treated an entire floor of their headquarters building because someone found a single bed bug in the building.
That treatment may have been completely unnecessary. That could have been a case of a single bug that had hitchhiked into the building and hadn’t yet laid any eggs. It’s also possible (although it’s unlikely they had any kind of infestation in that type of building) they could have had a small infestation, something that could have been mitigated with a more limited,and cost effective treatment plan.
A well trained dog could have searched the entire building for bed bugs, and pin pointed the exact location of an infestation, if any existed, allowing the City of New York to save thousands by only treating the affected area, instead of the entire floor. A dog can locate a single bug or egg hidden in a building, potentially saving you thousands on the treatment of an entire building.