Service Dogs (a specifically task-trained to help an individual with a disability that substantially limits one or more life activities) and Emotional Support Animals (ESA) ( a dog or other common domesticated animal that provides support to its disabled handler through companionship, non-judgmental regard, affection and/or being a distraction from the issues of daily life) provide a valuable and necessary service to their disabled handler.  The rights of the disabled persons to use these animals on airplanes is indisputable. However, there is a segment of pet owners who are abusing the system to bring their pets on airplanes at an alarming increase in the past few years.  Flight attendants have been severely injured or disfigured from animal attacks.  Planes are making emergency landings when untrained animals urinate and defecate on the planes.  It needs to stop.  The FAA needs to create a single certification system that is enforced by airlines and vets to ensure that all passengers/crew have a safe flight with trained service animals or ESA's, not someone's pet that they did not want to leave home.  We need to protect the passengers that need these animals.