I found one of my photos on Pinterest. I don't mind that people share the photos, as long as they give credit to the owner or point back to one of my websites. In this case, the photo was posted on someone's website without permission first.
Here is the photo that was used on a competing website without permission. This is Jaf enjoying the water in the Big Sewickley Creek in SW Pennsylvania. I added a watermark for ShopForPuppy.com, which is our online pet supplies store that gives back to the rescue community in terms of a donation from each sale.