Tails was abandoned when his family was evicted. His neighbor saved him from horrific conditions. She hadn’t seem him for months before they were evicted and quickly discovered that they simply had not been letting Tails go outside. He had been living in his own feces inside the house.
He has suffered a lot of neglect, he has flea dermatitis and hair loss. He may be suffering from congestive heart failure and looking for a quiet place to spend the rest of his days.