I've never encountered this before and I didn't see it here on the forums, sorry if I may have missed it.
I was updating my pet's profile -- Poof's, if it matters -- and was previewing it just fine multiple times. Then all of a sudden, to preview or save the changes, it started requiring me to do a recaptcha every single time. As a precaution before making this thread, I ran my antivirus (like the page linked says) and it said there was nothing wrong. I haven't been to any questionable sites lately, haven't downloaded any new programs or anything of that nature in awhile, this just completely came out of the blue for me. I'm using the latest version of Chrome on Windows 8.1!
[edit] I can also see the pet profile just fine when I'm viewing instead of editing/previewing. Like this link: Poof
oof, second edit: this is only happening with Poof for some reason. I checked my other pets and they don't get the recaptcha.
[edit] Solved thanks to Keith giving me a heads up! In case anyone's curious, I found the line that was causing Cloudflare to act up: "You know where you're going, right?" An odd one but oh well, easily rewritten in his story ♪