No, unless they intend to steal your TV. In the past, when a cat or dog went on a night stroll, they usually triggered the motion sensors, which lead to a false alarm. And false alarms aren’t cheap, as some companies charge you for it. In case you have a mischievous pet, the best option is to only purchase pet-immune motion sensors, as they are programmed to only alert when they detect the heat signature of a target above 40 pounds. This is a surefire way to sort out dogs and cats, so they won’t disturb your nights with false alarms.