right now he's standing guard which he just did naturally.Same goes for squirrels,I walk him in city parks (full of squirrels) the chattering is all it took.He's nuts for them,watching up in the trees for them if none on on the ground.
Him being 90lbs of rottie & Vally bull terror,when on leash he's pulled me down some scary hills in the pursuit of these pesty buggers,( I've learned to let go now).