Not all feeds found on farms are safe for horses. Here are some things to aviod:

• Urea (non-protein nitrogen supplement)
• Rumensin (a cattle growth promotant found in livestock minerals)
• Selenium
• Frozen Silage
• Commercial cattle and chicken feed
• Mouldy hay (particularly clover)
• Salt water
• Mouldy grain
• Treated grain that will be used for seed
• Hay containing blister beetles or known poisonous weeds
• Hay older then one year
• Large amounts of bread
• Poisonous plants
  - Japanses yew
  - White snakeroot
  - Leaves from black walnut
  - Red maple
  - Apricot
  - Oak and Apple trees
  - Some fescue grasses
  - Bracken fern
  - Horsetail
  - Deadly nightshade
  - Poison hemlock
  - Larkspur
  - Milkweed
  - Jimson weed
  - Rhubarb leaves
  - Ragwort
  - Oleander
• Don't permit your horse to lick old fertilizer bags (ammonia poisoning), old paint, pesticide containers (arsenic poisoning) and discarded batteries (lead poisoning).
• Feed additives, such as growth stimulants and antibiotics, have not been proven beneficial to horses. With this in mind, feeds containing these products should be avoided.