Hi! Your post got me thinking about a few friends who also suffer with PTSD, but because of allergies can not have dogs. I did some "Googling" and found this....
https://esadoctors.com/emotional-support-chicken/
If you're a VET, (I am!) this may interest you as well....
https://taskandpurpose.com/emotional-support-chickens
And I found this article.....that says, "Chicken owners can apply to work with an organization called
Intermountain Therapy Animals, based in Utah. You and your chicken will be screened for suitability and if you’re deemed to be suitable, you can proceed onto the team training course." (3rd to last paragraph)
https://backyardpoultry.iamcountrys...therapy-chickens-combat-isolation-loneliness/
At the end of the article are links that you might want to read....I am.
Good luck!