Recommended Guard Dog Training Book

I've mentioned this book several times in my Youtube videos. This was the book I first started using when I trained my first guard dog back in 1989. It's an old book from the 1960's, but I still refer to it often today. If you purchase the book through this like, I receive a small commission.

The Koehler Method of Guard Dog Training; An Effective & Authoritative Guide for Selecting, Training & Maintaining Dogs in Home Protection, Plant Security, Police, & Military Work