Does your ADT security system need to be calibrated for small pets?
The short answer is yes. The different types/brands of alarms will have different defaults on weight thresholds. So depending on how small your pets are, your alarm may have to be calibrated accordingly. Some alarms are set to a 40lb threshold by default. Others, like DSC have wireless motion sensors set at 60lbs pet immune.
Make sure your motion sensors are calibrated to the proper weight setting for not just pets, but small children.