The WCAG guidelines were updated from version 2.0 to 2.1 in June 2018. The updates in 2.1 cover changes in technology that have occurred since the previous version, and also address areas that were underrepresented in 2.0. What does this mean for you? Not a lot right now. The compliance level targeted is still WCAG 2.0 Level AA, and the 2.1 success criteria are in addition to those already existing in 2.0.
Individuals with disabilities may use service animals and emotional support animals for a variety of reasons. This guide provides an overview of how major Federal civil rights laws govern the rights of a person requiring a service animal. These laws, as well as instructions on how to file a complaint, are listed in the last section of this publication. Many states also have laws that provide a different definition of service animal. You should check your state’s law and follow the law that offers the most protection for service animals.  The document discusses service animals in a number of different settings as the rules and allowances related to access with service animals will vary according to the law applied and the setting.
ADA stands for the Americans with Disabilities Act, and it has been the law of the land since 1990. Title III (private sector businesses) of the Americans with Disabilities Act (ADA) prohibits discrimination on the basis of disability in places of public accommodation. It applies to any business that has 15 or more employees. While Title III of the ADA is typically known for its applicability to offline barriers such as lack of wheelchair access, acceptance of service animals, effective communication for hearing and vision impaired individuals, its focus in the digital age has turned to websites and online media.

The words in the tag should be more than a description. They should provide a text equivalent of the image. In other words, the tag should include the same meaningful information that other users obtain by looking at the image. In the example of the mayor’s picture, adding an “alt” tag with the words “Photograph of Mayor Jane Smith” provides a meaningful description.
Colleges and universities may have a policy asking students who use service animals to contact the school’s Disability Services Coordinator to register as a student with a disability. Higher education institutions may not require any documentation about the training or certification of a service animal. They may, however, require proof that a service animal has any vaccinations required by state or local laws that apply to all animals.
Predictable: Websites should operate in ways that are familiar and predictable. When a new page element is in focus, the website should not initiate a change of context such as opening a new window or going to a new page. In addition, the website should warn of user-initiated changes of context ahead of time, for instance through the use of a submit button. Navigation and labeling should remain consistent between different pages.

Service animals – For evidence that an animal is a service animal, air carriers may ask to see identification cards, written documentation, presence of harnesses or tags, or ask for verbal assurances from the individual with a disability using the animal. If airline personnel are uncertain that an animal is a service animal, they may ask one of the following:
Federal law isn't the only consideration for businesses. Additionally, each state interprets the law differently. Consider the case against Netflix in 2012. Lawsuits were brought in federal court in Massachusetts and California. Netflix was accused of violating the ADA by not offering "closed captioning" options for its Internet streamed movies. Illustrating the complexity of this issue, the courts reached completely opposite decisions. Massachusetts held that Netflix must comply with the ADA, while the California court found that Netflix did not fall under the ADA's definition of "public accommodation."