Need wicked thorny barrier bush to keep neighbors animals off property

An Osage orange fence row will do it, but takes work and a few years to establish. Here’s an acceptable guide. Osage orange fence instructions a reply to: DigginFoTroof

It's already been mentioned, but my first thought was Prickly Hawthorn.

Gorse has also been mentioned, but it's a very slow grower in the beginning, can get out of control easily once established, and can be a nightmare to manage in the long-run.

I do have one suggestion, though - a motion activated sprinkler system;

Pestbye Motion Activated Sprinkler

My review is the second from top, by 'kuma', that's me trolling my daughter, lol.

When we first moved into the new house we had big cat poo problems on the lawn, I tried everything and the only thing that has ever truly worked was the sprinkler. I only had to use it over the course of one summer, now the cats (apart from one, who's my little buddy) know not to go into the back garden.

Good luck!

a reply to: MerkabaTribeEntity

I really like the idea of the motion activated water sprinkler.

Chickens can fly so I doubt bushes and shrubs will work.

I was wondering how he was going to block or close off his driveway.