FirstLoveMovies

https://www.imdb.com/title/tt3369806

A military dog that helped American Marines in Afghanistan returns to the United States and is adopted by his handler's family after suffering a traumatic experience.

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This movie doesn't have any female children afaik but it does feature a male teen that I'd say fits FLM age so ig this is still On topic for FLM

If you want a female child, just skip this one and watch the Sequel

When the movie was released he was still 16 so he is definitely young enough.