Well, if you hug and kiss your dog regularly. Then you should be much concerned about this. Plus, you should keep his/her nails, paws, fur, skin, and eyes clean for him and for yourself.
You can do all of this at home easily with the correct sets of tools. Besides this, if you are looking for someone who can write an ESA letter online. The answer is either a psychiatrist, therapist, or any general physician. But before that, you might want to check out the criteria for getting an emotional support animal letter to get your pet certified.