Robotic watchdog pack

Each pack comes with several micro-robotic ticks, which get under the intruder's pants.

They know their boss, they recognize unwanted strangers, they smell fear, and can wake up the owner by communicating with the cute old San Bernard that always lies down in the corner of the living room, and looks like it's an extension of the rug.

When the mobile network communications have been shut down they will resort back to barking.