Here’s an interesting question for you medical dopers.
Animals (other than humans, of course) can have many medical conditions that are similar to human ailments. For example, a horse can have a broken leg and a pig can have a bacterial infection.
Is it meaningful to speak of animals as having mental illnesses? Is it possible, in theory, to have a schizophrenic duck (in the sense that the duck actually has schizophrenia or a veterinary equivalent), a sociopathic turtle, a horse with panic disorder, a cat with gender identity disorder, or a sheep with OCD?
I’m more interested in whether a veterinarian can legitimately diagnose or treat mental illnesses in animals than anecdotes about pet behavior.