I think at that point, you look at the poster's history/motive. If someone who doesn't makes a lot of OPs showed us this picture, I'd be a bit sentimental, and would think this person really loves their cat and wants to share that love with their best frens.

now if someone who makes a lot of OPs showed us this picture, i wouldn't take it as seriously and just move on.

let it fade by lack of interest, I also might think it's a joke, and not actually that person's cat.