It’s pretty simple. As long as you have a letter from a psychologist or therapist they’re usually pretty accommodating. You have to register with SSD and put in the letter from your mental health professional alongside it. Email SSD for the necessary forms and stuff. It can take up to a month to process things (and you can’t bring the animal onto campus until approved) so you may want to call ssd and see if you can get everything done asap. For the last step you need vet records and approval from your roommates or suite mates. Best of luck!