* Thorns: The thorns on blackberry bushes can be a serious hazard for horses. They can cause puncture wounds, lacerations, and even infections in the mouth, tongue, and digestive tract.
* Toxicity: While blackberries themselves are not toxic, the leaves and stems of the plant contain substances that can cause gastrointestinal upset, diarrhea, and colic in horses.
* Lack of Nutritional Value: Blackberry bushes don't offer much nutritional value for horses, and their diet should be primarily hay and grain.
If you see your horse eating blackberry bushes:
* Remove them from the area immediately.
* Inspect your horse's mouth and body for any signs of injury.
* Contact your veterinarian if you suspect your horse has ingested any thorns or if they show signs of illness.
It's always best to err on the side of caution and avoid allowing your horse to graze on blackberry bushes.