Mom, Can I Keep Her? (1998)

"500 pounds of furry fun..."

Timmy Blair has the usual twelve-year-old’s share of problems: his father is too busy at work, his new stepmother loads him with chores, and school life is as difficult as ever. When a furry friend follows him home from school, Timmy is delighted. There’s only one problem. His new-found buddy is a 500 pound gorilla.