I've had some luck breaking animals of unwanted intrusions and running them off with a Supersoaker loaded with a mix of sudsy ammonia and plain water. The detergent allows the mix to soak into fur and ammonia is relatively safe, temporary, and quite unpleasant.

I consider attacking livestock to be far more serious than what I would use a chemical deterrent for but it is an option.

This has also worked to run raccoons, rats and squirrels out of attics and stray dogs and cats out of crawl spaces.

Won't work anyway, most new antifreezes now have bittering agent added to prevent that from happening.