What type of animal is Jill's dog, which was prescribed to help ease her PTSD symptoms?

The correct choice is Emotional Support Animal (ESA) because these animals are specifically designated to provide comfort and support to individuals facing mental health challenges, such as PTSD. Unlike service animals, which are trained to perform specific tasks for individuals with disabilities, emotional support animals do not require specific training; their primary role is to offer emotional comfort and alleviation of distress through companionship.

The use of an ESA in the context of PTSD highlights their importance in therapeutic settings, where their presence can significantly improve the owner's overall emotional well-being. This distinguishes ESAs from therapy or service animals, which have different functions and training requirements. In this scenario, Jill’s dog serves to assist with her mental health symptoms rather than to perform physical tasks related to a disability.