Depending on the species and the diagnosis, a behavioural or reeducation will be necessary. Cats often need restructuration of their environment, dogs maybe need to learn to "sit and look" so they don't go after the squirrels. Horses may need both therapies.
The food, the habits aso must be controlled, in order to avoid any emotional inbalance. All education is based on positive reinforcement.
At first, the absence of somatic illnesses must always be verified.