Extreme pyschological pain is as real and tormenting as physical pain, so for an unhappy animal bewildered by its own outbursts ...
Well said. I would contend that we can know nothing of what is going on in that animal's mind and it is our duty to release it from the restraints we must necessarily place on it for our own safety and that of other humans and animals, and provide it with an easy death.
Even the best efforts of psychiatrists, therapists and the pharmaceutical industry, together with intervention and support from family members, social workers, the church, volunteers and others, leaves an ever-reducing, but still significant, number of people with psychiatric illness which cannot be treated effectively.
How much less do we know about treating animals with psychiatric illness?
Should we leave an animal to suffer - and suffering it most undoubtedly is, as you say so clearly - just because we are unable to treat it?