ESA is the option that is for the safety of the owners but there are some points, that are mandatory and the first is registration. Any animal, which is domestic, can be taken as ESA no matter if it is rat or rabbit. However, this registration requires some evidence that is to be produced in front of the authority in the form of prescribed letter. This letter is nothing but a note that describes that a person is a registered patient of any professional and licensed mental therapist. There are emotional support dog laws that are made for the dogs and this provides the authority to the dogs to act as ESA. The people must also know that the severity of the mental disorder is also important and all the disorders like depression, anxiety and other mental diseases are counted in this segment. The letter that is provided to the patient must be written on the actual letterhead of the professional doctor and the same must duly sign it. This is required because all the information is stuffed in it. Actually, registration is not important because this is just to avoid the issues. However, according to experts, this process is required to avoid the conditions when you take the pet in public or in flights. 
The emotional support dog laws allow this and the person is free to do all the activities. It also helps in differentiating between the service animals and ESA. There is an organization, that deals with the registration process and the name of this organization is NSAR (national service animal registry). After completing the formalities here, one is free to register the animal but the authority will also check the disability of the person. They also check whether the animal can be taken in public or not. There is a fee structure, that is to be followed by the person but the fee is nominal and after this, the NSAR ESA letter or certificate is provided. The registration certificate is an ID with a photo that can be attached to the vest of ESA. There are some people who are always confused about the number of ESA then they must be aware that there are no rules that state about the number. One person can keep any number of the pet but it depends on the capacity of the owner because the requirements of all the animals are the same and they must be fulfilled as well.
However, the process is required because to keep more than one ESA there are documents that are to be completed and a professional must deliver this. However, still, there are some issues because the property owner also has some rights and he or she can limit the ESA based on breed and size. Even the letter does not bar the rights of the property owner and it is truly their interest, they may or may not allow more than one pets inside the house.
