Thinking of wiring into the interior light, with a heavy enough fuse wire so it takes long enough for you to get in the cab and turn the light off......
We have a cocker spaniel, and the tail situation is the same, when used as gun dog it keeps tangle free ( although you'll never keep their ears free of burrs, teasels, grass darts etc, etc) I'm sure someone else will have something to add....
F
We used to wire crow scarer bangers up to both sides of a coil with fuse wire as kids, wire got hot an set it off under the bonnet :D
Just needs a bit of refinement/delay for the cab :screaming_bug_eye_f