What is a horse with bad temper called?

There isn't really a specific, widely accepted term for a horse with a bad temper. However, you can use some descriptive terms like:

General terms:

* Hot-headed: This implies a quick temper and a tendency to react strongly to stimuli.

* High-strung: This describes a horse that is easily excited or agitated.

* Nervy: Similar to high-strung, this describes a horse that is easily spooked or anxious.

* Touchy: This implies a horse that is easily angered or upset.

* Difficult: This is a general term that encompasses a variety of behavioral issues, including bad temper.

More specific terms:

* Biting: This describes a horse that uses its teeth to express aggression.

* Kicking: This describes a horse that uses its hind legs to express aggression.

* Rearing: This describes a horse that stands up on its hind legs, often as a defensive reaction.

* Charging: This describes a horse that runs at someone or something aggressively.

Ultimately, the best term to use depends on the specific behavior of the horse.

It's important to remember that a horse's behavior is often a result of its environment, training, and handling. It's best to consult with a professional trainer or veterinarian if you are concerned about a horse's temperament.