no it is fictional
no it is not because if it was a true story it would say based on a true story.
It's actually based on a true story about a deadly diphtheria epidemic that broke out in 1925.
yes
No. See the related link below for info on the original 1969 movie.
Durign the movie he was probably keeped somewhere so he could not swim away, and probably can't live in the wild anymore because now he is not used to it.
Tales from the Console Graveyard: Atari 2600
Scary Tales Based on True Stories
The Dog Day Lawsuit
How to Do Transitions in Triathlon Races