I've started using a neck stretcher on my lease. At first, he was acting fine but at about 1/3 of the lesson he started moving abnormally. He started ignoring my leg and my hands.
He's used the neck stretcher before, he just hasn't used it in a while.
Also, I was wondering if a beginner can cause a horse to, over time, become unresponsive?
I also have no control over using the neck stretcher or not, and I have no control over who rides him because I only lease him.