The first theoretical part of this thesis focuses on the definition of therapy with the horse, its framework, its target audience and the therapeutic relationship. Then, an entire chapter is devoted to the horse; Why use it as a therapeutic ally? It is important to know some ethological elements to understand the modes of functioning, communication, and especially the relevance of the use of the horse in a therapeutic care. Different functions of the therapy with the horse, in particular the containing, corporal, mirror and social functions are developed, always related to the management of the emotions, more particularly to that of the anger, problematic in the heart of this research work. An entire chapter is then devoted to anger; what are its origins, its benefits, its role? Various tools and strategies are then proposed to react adequately to this emotion, whether in terms of postures, behavioural skills or actions to be implemented. These techniques are initially intended for anyone who is faced with an angry person.