Oddities often consumed by horses on pasture.
No problem, assuming fairly limited quantities and otherwise balanced ration:
Dandelion
Thistle (NOT Russian Knapweed or yellow star thistleCentaurea spp)
Sunflower seeds and plant
Peanut plants
Raspberry/blackberry bushes
Wood/bark of most trees (NOT Prunus spp or black walnut or locust)
Potential problem if eaten in large quantities:
Buttercup
Morning glory
Pokeweed
St. Johnswort
Gum-weed
Astragulus and Oxytropis spp/(vetches and locoweed)
Avocado leaves
Bracken fern
Most bulb type flowers (tulip, iris, etc.)
Wilted red maple leaves
Acorns/new oak leaves
Avoid at all costs (Lethal or severe toxicity potential)
Lily of the Valley
Larkspur
Tomato or potato plants
Rhubarb leaves and roots
Poison hemlock
Foxglove
Leafy spurge
Mustards
Jimsonweed
Alsike clover
Blue flax
Sorghum (Johnsongrass and Sudan grass)
Oleander
Privet
Japanese Yew (all Taxus spp)
Azalea
Rhododendron
Mountain Laurel
Pits of peaches, cherries, or avocados
Horsechestnut
Russian Knapweed or yellow star thistleCentaurea spp
Potential Treats
Perfectly acceptable treats (fed in limited quantities (<1-2 lbs/feeding)
Carrots, apples, grapes
Bananas
Peas
Green beans
Lettuce
Celery
Dried beans, such as pinto, red, fava (however should be cooked or heat treated)
Watermelon rinds
Squash
Mangoes (not the seeds)
Raisins
Bread/bagels/cake (NOT if they contain chocolate or poppy seeds)
Pasta, macaroni
Potato chips and potato products (do not give raw potatoes to pregnant mare it is toxic gives them blood poisoning).
Rice products (not raw rice)
Barley products
Corn products
Dairy products
Eggs
Fruit juices
Hot dogs, hamburgers, tuna fish, ham or even roast beef sandwiches!
Most dog and cat foods
Zucchini
Watermelon
Parsnips
Pumpkin
Beware large quantities, but probably acceptable in very small amounts (<2 to 4 ounces/day)
Cabbage, broccoli, kale, chard, collard greens, brussel sprouts
Spinach
Rhubarb stems (NOT the leaves or roots)
Garlic and onions (large amounts may cause anaemia) When lower doses are consumed on a regular basis, or Large amounts are consumed this may cause anaemia...(the same goes for onions.... to much can cause anaemia).
Turnips
Radishes
Avocado (NOT skins or seeds)
Lathyrus spp. Beans (India)
Sunflower seeds
Sugar candies such as jelly beans, gummy bears, peppermints, etc.
Safe in very limited quantities BUT WILL CAUSE POSITIVE DRUG TESTS
Morning glory plants
Sassafras
Willow leaves and bark
Yucca
Tobacco (consumed, not inhaled)
Valerian root
Carrots in very large quantities only (over 5 lbs day)!
Persimmons (seeds also may cause impaction)
Chocolate in any form
Liquorice?
Cinnamon products
Nutmeg
Hot pepper/chilli flavoured products (Nacho chips, etc)
Non-decaffeinated coffee or tea in any form
Caffeinated sodas
Alcoholic beverages?
Some dog/cat foods (Beware bakery waste as an ingredient-may contain chocolate)
Summary:
There are obviously a wide range of things that our horses may enjoy consuming, not all of which are good for their health. Many horses would refuse to even sniff many of the items listed above. Knowing which potential treats are safe, at least in limited quantities, is important for horse owners. You never know what might be offered to your horse!