That twitchy leg is a signal from your dog’s nervous system.
Source: Why do dogs’ legs shake during pets? It’s not because they like it.
i think this is similar to how cockroaches have sensors on their back/legs that sense the air pressure wave from the incoming swatter, and the legs are made to jump without requiring a trip to the brain & back. which means when swatting a cockroach, try to swat from the front side of the roach. or maybe any fly?
