What a joy ! got to look in nbrs barn- unopened for over 20 years plus 12 plymouths

Nah - a cow will work... A Llama or donkey would be even better. They get protective and territorial. But any look of activity will keep the theives away. I also like leaving shell casings and targets out in plain site...

Sounds like a great neighbor. Have them over for a cookout - build some bridges.