Artists Websites:
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Kuroi-Wolf:
Furaffinity : http://www.furaffinity.net/user/kuroi-wolf/
DeviantArt : http://kuroi-wolf.deviantart.com/

Caroo:
Furaffinity : http://www.furaffinity.net/user/caroo/
DeviantArt : http://caroos-dungeon.deviantart.com/

The artist has more "Tickle Pet Luna" themed images, but these were released as a multi-part set, so I didn't want to include the others which were released separately.
At a later date I might upload his entire collection, but that might take a bit. (400+ images)

Base +3, Rigelus +6

That horse has toes.

Base +7

This artist appears to like tickling toes a fair bit, though he has made some comics involving a character with hooves having their frog (look up your horse anatomy) tickled.

Base +3

These aren't by Caroo. They were created by another artist named Kuroi-Wolf. Caroo was the commissioner and colorist.

Base +6

I looked into it, and you are correct it seems. I updated the title and description to include both. I put in a request to add Kuroi-Wolf to the artist list so I can add him there, too. Thank you, I might have never noticed that otherwise.

Base +3