How is “after all” used?

In The Art of Racing in the Rain (2019), one line is: “After all, I'm just a stupid dog.”

Which movie is “after all” from?

The clip at the top of this page is from The Art of Racing in the Rain (2019).

After all, I'm just a stupid dog.

8 作品で登場 · 1 本目

used when you are explaining sth, or giving a reason; despite what has been said or expected

412 本の映画に登場イディオムを再生

定義：Oxford Advanced Learner's Dictionary 第 9 版