Here is a list of some of the most poisonous plants for horses.
10 most toxic plants to horses
There are many poisonous plants out there that can harm your horse, so it's important to remember how they look like. Use the link for more information: http://paolashorseblog.blogspot.com/2013/08/twelve-plants-not-to-have-in-your.html
Getting ready for a show
List of what's safe and what isn't safe to feed your horse.
The Equestrian Survival Guide | ZsaZsa Bellagio - Like No Other
Keep in mind, that black walnut is toxic to horses in saw dust as well!
Ten Commandments of a horse
If My Horse Doesn't Like You FUNNY TIN SIGN metal western barn wall decor OHW