Emotional support animals, comfort animals, and therapy dogs are not service animals under Title II and Title III of the ADA. Other species of animals, whether wild or domestic, trained or untrained, are not considered service animals either. The work or tasks performed by a service animal must be directly related to the individual’s disability. It does not matter if a person has a note from a doctor that states that the person has a disability and needs to have the animal for emotional support. A doctor’s letter does not turn an animal into a service animal.
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An example is Patagonia Works, Inc. which had a complaint for a permanent injunction filed against it in the United States District Court stating, Under Section 302(b)(1) of Title III of the ADA, it is unlawful discrimination to deny individuals with disabilities an opportunity to participate in or benefit from the goods, services, facilities, privileges, advantages or accommodations, which is equal to the opportunities afforded to other individuals. 42 U.S.C. 12182 (b)(1)(A)(ii). Below is a summary of what the lawyers asked the court for.
Title III also has applications to existing facilities. One of the definitions of "discrimination" under Title III of the ADA is a "failure to remove" architectural barriers in existing facilities. See 42 U.S.C. § 12182(b)(2)(A)(iv). This means that even facilities that have not been modified or altered in any way after the ADA was passed still have obligations. The standard is whether "removing barriers" (typically defined as bringing a condition into compliance with the ADAAG) is "readily achievable", defined as "...easily accomplished without much difficulty or expense".

There are exceptions to this title; many private clubs and religious organizations may not be bound by Title III. With regard to historic properties (those properties that are listed or that are eligible for listing in the National Register of Historic Places, or properties designated as historic under state or local law), those facilities must still comply with the provisions of Title III of the ADA to the "maximum extent feasible" but if following the usual standards would "threaten to destroy the historic significance of a feature of the building" then alternative standards may be used. 

A. No.  Municipalities that prohibit specific breeds of dogs must make an exception for a service animal of a prohibited breed, unless the dog poses a direct threat to the health or safety of others.  Under the “direct threat” provisions of the ADA, local jurisdictions need to determine, on a case-by-case basis, whether a particular service animal can be excluded based on that particular animal’s actual behavior or history, but they may not exclude a service animal because of fears or generalizations about how an animal or breed might behave.  It is important to note that breed restrictions differ significantly from jurisdiction to jurisdiction.  In fact, some jurisdictions have no breed restrictions.
A. The ADA does not require covered entities to modify policies, practices, or procedures if it would “fundamentally alter” the nature of the goods, services, programs, or activities provided to the public.  Nor does it overrule legitimate safety requirements.  If admitting service animals would fundamentally alter the nature of a service or program, service animals may be prohibited.  In addition, if a particular service animal is out of control and the handler does not take effective action to control it, or if it is not housebroken, that animal may be excluded.