You're starting to get a bit weird.
Usually, the way I fish up an internet photo that I don't have readily catalogued is to sweep Google Image. Then I usually check the source to the point of making sure it isn't "MonkeyBoinkers.com" or something (such things tend to distract the easily distractable). This had a name that sounded like some vet's blog or something. I flipped for a moment to the main page to make sure, and that was all I did as far as backup research. I didn't read it at all until you mentioned the quote.
Why the source should matter all that much on a photograph is kind of odd, unless you assume it's some kind of elaborate digital creation. I can get background on it if you're all that interested.