Most of these were done after studying and sketching a lot of reference, I used what I learned to pose the animals. And some of these poses were taken more directly from reference photos. I found reference on DeviantArt, and have credited the photographers here under each painting that it applies to.
Pose reference photo by iskra85
Pose reference photo by FantasticFennec
The texture used here was photographed by DeathlyRain
Pose reference photo done by squirrelhollow