School grounds are among the most tightly regulated surfaces in the region for chemical application, and it is worth understanding that before anyone proposes a repellent. Connecticut restricts school pesticide applications during school hours or planned activities, and requires boards without a qualifying IPM plan to give annual pesticide-policy information to staff and parents. Massachusetts requires every school to have an IPM plan, requires two to seven working days' written notice to parents and employees before an outdoor application on school property, and restricts outdoor applications made for purely aesthetic reasons. New York goes furthest, prohibiting pesticides on school and day-care playgrounds, turf, athletic and playing fields, with limited exemptions.
A handler and a trained dog are not a pesticide application and do not engage any of that. Nothing is applied to the surface, nothing needs a notification period, and nothing has to be timed around a re-entry interval. On a New York athletic field in particular, where turf applications are largely prohibited outright, that is not a marketing point; it is most of the available option.
It also sidesteps the conversation nobody wants at a school board meeting, which is a parent asking what was sprayed on the field their child practises on.