According to web sources, he was a Boston Terrier. He may have been a mix but looking at Wikipedia articles and comparing them, he looks like Boston Terrier. Most recognizable for me are his bulbous eyes, pits don’t have those big round eyes.
Great story. Thanks for linking.
I like pits, but he’s clearly a Boston Terrier. As you point out, the eyes...head and face is overall all wrong to be a pit.