The two disorders according to Braitman that the animals suffer from includes the obsessive compulsive disorder (OCD) and depression. The animals suffering from the obsessive compulsive disorder have to do a certain ritual before they do a task or have an item near themselves before moving on to another task.
The animals are also known to suffer from depression that may deteriorate their health and diminish their appetite.
Hence, the answer is 'OCD and depression'.