More people are bringing their animals with them -- into stores, onto planes. Some are service animals, highly trained, assisting with such tasks as pulling a wheelchair or retrieving medicine. They also assist people who are blind or experiencing seizures. These animals are covered under the Americans With Disabilities Act and allowed in most public places. Emotional support animals are sometimes prescribed to a person with a disabling mental illness but they do not have the same legal protections. And there are also therapy pets. We'll find out what these various animals do, where they're allowed -- and why conflicts may arise.