
Based on a definition of CAT-H by Dolores Arste and Kellie Snyder.
While working on her Master’s thesis, behavioural science student Kellie Snyder noticed that positive reinforcement methods like clicker training, or giving food treats, didn’t work so well on animals when there was a lot of fear involved. With the help of her professor Dr Rosales-Ruiz, they devised a way to work with aggressive dogs who hadn’t responded to any amount of positive reinforcement training, and sometimes years of this and other training.
He called this idea CAT (Constructional Aggression Treatment), but with his approval, for horses we have slightly changed the name to CAT-H (Constructional Approach Training for Horses.)
In the CAT treatment, they used the reinforcer (reward) which the dog was already working for. When the dog was aggressive, people or other dogs normally and not surprisingly moved away.
This was his reward, because what he MOST wanted was distance from the object of his fear. However during CAT, the outcome he wanted was given only when he behaved in safe, friendly or calm ways. This meant his needs were still being met, but he wasn’t putting the lives of others or his own life at risk any more. In effect he was now in control of his environment, and this is very empowering for a fearful animal.But a funny thing happens in the treatment. He learns to LIKE being calm and friendly.
The experimental question asked whether aggression could be reduced by taking away something the dog didn’t like, another dog or a person, called a decoy, at a time when he was not being aggressive. This dog or person was introduced in a very non-confronting way, always trying to stay below the point where the animal reacted, and the decoy would move away as the reward, but only when the animal showed any sign of being more relaxed.
They found out more than their questions asked… that they not only ended up with animals that tolerated the strangers they were once aggressive toward, but ended up with them actually being friendly toward the strangers, and calm where they used to be scared. (This has been successfully replicated with feral cats, birds, llamas, cows, and now even reptiles too.)
Long time clicker trainer Dolores Arste thought this idea might be useful applied to “problem” horses, though horses are mainly presenting with fear rather than aggression. The sort of horse who goes in the horse float but then explodes for no apparent reason. Aggression, fear or over-excitement will cause animals to have a restricted life, or a life of fear and defensiveness. She wanted them to learn that the world isn’t such a bad place and that there are other ways for them to deal with new people/animals/things that are easier, more effective and produce better results.
By teaching horses to be “not aggressive”, “not fearful”, “not overly excited” by giving them food or other positive reinforcers, we don’t help them deal with the actual problem. In theory it sounds good–teach them to look to the owner– but what if you could teach the horse that he doesn’t have to turn away and hope his owner is on the ball, but instead simply not be afraid any more?
That’s what a group of horse lovers all around the world have repeatedly managed to accomplish through CAT-H, using “giving distance” (pure negative reinforcement), combined with a low stress approach. Sometimes people say, oh but this is just approach/retreat. It isn’t though, because of the retreat being given only when the animal shows calm. Also at the point where a lot of people doing approach/retreat would say, “they’re ok, so I’ll step in closer”, we would still step away to continue to reward the animal.
Though this is a science based idea, the more CAT we do, the better we get at SEEING and then FEELING the first TINY signs of fear. Very cool :-). And because the animal feels in control of the process, they even look completely different, they are no longer scared but alert and in self carriage. They look, as they say, Empowered.

By the way, another funny thing also happens, once the CAT-H has done it’s job, the horses actually ask when they’re ready to go back to clicker training, which is a great tool for general training.




Hello there. Thank you for this article. It opened my eyes to a new possibility with one of my horses! I have been using CAT-H after learning of it through a Warwick Schiller video a couple of years ago. But reading your article made me better understand how I could try using it to solve a problem that one of my horses has that neither R+ nor other careful (or to the best of my imperfect skill level) efforts to help him feels seen, herd, felt, and “gotten.”
Thank you for the light bulb moment!
Thanks – that’s wonderful to hear!
Can this be used in a field with multiple horses…i mean, can it be used on one horse but in a field with multiple?
Hi Carrie,
Yes, it sure can be used in that situation as the horse you’re communicating with will know and see your responses, even with other horses around. But if the other horses are blocking you visually, it may not be as effective so in that case, you can just move away from the other horses into view again. Do this in a way that still includes the CAT principles so the horse you’re focusing on, doesn’t suddenly get over-faced with your movements towards them.
Let us know how it goes. 🙂 Cynthia.
curious have been seeing this term used but need to figure out what/how to apply
thanks for listening
Hi Tana,
there are several youtube videos you can watch and I’m sure if you google CAT for horses there may be even more info available.
Cheers, Cynthia.
Brilliant, thank you