One thing to remember that the article does not point out is that it is the person with the disability (or need) that has the rights, NOT the animal.
For instance, in order for a dog to be considered a service dog, not only is that dog required to be trained TO MITIGATE THE HANDLER'S DISABILITY, but the handler has to fit into the ADA guidelines of a QUALIFIED PERSON WITH A DISABILITY.
http://www.eeoc.gov/policy/docs/902cm.html
What I mean by that is: I am a qualified person with disabilities (QPWD). My dog is trained for mobility tasks, and retrieval and fetching tasks. My dog goes with me (or enables me to go) almost everyplace. She is a service dog for me. My friend cannot take my trained SD into places that do not allow pets, because she is not a service dog for that person--that person is not a QPWD. And though I am a QPWD, I cannot take my friend's hearing dog with me, because I do not have a hearing disability.
this is a small portion of that info:
Similarly, an individual might be eligible for disability retirement but not be an individual with a disability under the ADA. Conversely, a person who meets the ADA definition of "disability" might not meet the requirements for disability retirement.
(b) Statutory Definition -- With respect to an individual, the term "disability" means
(A) a physical or mental impairment that substantially limits one or more of the major life activities of such individual;
(B) a record of such an impairment; or
(C) being regarded as having such an impairment.
So besides knowing that, (and everything else at that site) it will help you to know what the MAJOR LIFE ACTIVITIES are:
902.3 Major Life Activities
902.3 Major Life Activities
(a) General -- For an impairment to rise to the level of a disability, it must substantially limit, have previously substantially limited, or be perceived as substantially limiting, one or more of a person's major life activities. There has been little controversy about what constitutes a major life activity. In most cases, courts have simply stated that an impaired activity is a major life activity. In general, major life activities "are those basic activities that the average person in the general population can perform with little or no difficulty." 29 C.F.R. pt. 1630 app.§ 1630.2(i).
(b) Regulatory Definition -- Commission regulations define the term "major life activities" to mean "functions such as caring for oneself, performing manual tasks, walking, seeing, hearing, speaking, breathing, learning, and working." 29 C.F.R. § 1630.2(i); see also Senate Report at 22; House Education and Labor Report at 52; House Judiciary Report at 28.
This list is not an exhaustive list of all major life activities. Instead, it is representative of the types of activities that are major life activities. Specific activities that are similar to the listed activities in terms of their impact on an individual's functioning, as compared to the average person, also may be major life activities. Thus, as the interpretive appendix to the regulations notes, "other major life activities include, but are not limited to, sitting, standing, lifting, [and] reaching." 29 C.F.R. pt. 1630 app. § 1630.2(i). Mental and emotional processes such as thinking, concentrating, and interacting with others are other examples of major life activities.19
there is also more in that portion.
Many people have what are called "invisible disabilities", meaning that it is not obvious that they are disabled. When someone says they are disabled, believe them until they cannot provide the needed info and documentation.
You as a landlord have resources other than attorneys to get basic information and guidance. The ACT itself, though long, is written in generally understandable English, and needed information can generally easily be found. If nothing else, copy the ADA into a word doc so you can search it more easily.
Use the ADA hotline when you can't find the answer to your question.
I am guessing, but there is probably online guidance re ESAs, too. You may need a lawyer. But do your homework first.
This is a broad area, and the information seems overwhelming. It gets confusing, and with the fakes that now abound, it's even more difficult.