His cat is a monster to handle, by the way.
Tell your hubby to picture his cat 1000 pounds heavier, with the equivalent power!
After many different horses, and most of them tricky to handle - aka stallions with issues - I have come to realize you need to have balance in the way you treat them.
Give them a carrot, give them a slap, whatever is most fit for the situation. Just like boyfriends!
I usually try to reward a good behavior instead of waiting for the bad one to arise. So instead of waiting for the day the horse decides it would be fun to be on my lap instead of leading correctly, I try to teach them that if they do things the way I want them to, they get a treat, or a pat, or whatever they like.
Trust me, it comes to a point where as soon as they see you they start trying to catch your attention.
They'll be focused on you which makes handling *and* ridding incredibly easier. The photo on the link below is me and my first horse a few years ago. He was considered unridable and I purchased him as a 7 year old stallion who would lunge at people to bite.