Just because a photo may be unflattering doesn't make it illegal to use. Now, if you're using an unflattering photo specifically to slander that horse (or the breeding program, etc.) then you're running into other laws (slander or libel, depending on the situation) not because you used a photo of that horse, but in what you were using it for.
Again, if the horse's owner gets upset because a picture of her horse is on the internet in a completely neutral thread such as this one where there really isn't even enough information to identify the horse, she can let the person who posted it know she's angry or upset about it, never speak to her again, stop inviting her over for Christmas dinner, etc. but it's not illegal.
Originally Posted by NdAppy
She's not being singled out. I've asked that of others as well.
Sorry, I hadn't seen the question put up in anyone else's threads.