Where doge is both the name of a title (like duke) but it is misspelt "dog". The use of "Venice" where doge's are could increase a the likelihood of a smarter spell check keeping doge and not correcting to dog. Looking at a wider context might see that Bob is talking about a pupper.
A simpler example would be "spell cheque"
When teaching for your dictionary, ask: "is it obvious what they mean if I'm not being pedantic?"
If I spell the word “pale” as “pal”, that is not an acceptable spelling for the word “pale”, even if it is coincidentally the acceptable spelling for an entirely different word.
If I asked a human editor to spellcheck the sentence: “His mouth dropped and he turned pal.”, the editor would correctly indicate I had misspelled the word.
Spellcheck hasn’t done this in the past because it can be quite difficult. But that’s a limitation of computer capability, not functionality bounded by the definition of the term “spellcheck”.