New here! I was wondering if I could use this image for a horse :

https://s-media-cache-ak0.pinimg.com/originals/d3/18/3b/d3183ba811844d10326892bfcb28992e.jpg. 

Im not sure if I can even use it, and if I can I need help with how to credit it. Thanks!

All images must be stock images. Not sure if that one is, however if you just did a google search then it might not be.

It looks like the image you found is from a German Auction website, and unless it states that the image is free to use, it's probably not stock.

If you want more information about stock images and crediting check out this section under the help link:

http://horsephenomena.com/help/other_info.php#stockandcredits

I hope that helps. :3

Okay thank you for the information!