A tying-up is an inflammation of the back muscles. The horse experiences severe pain. The trigger for a tying-up is a metabolic disorder. The disease is triggered when a horse eats too many carbohydrates by feeding hay.
A tying-up is manifested by a clammy hindquarters and a hard croup musculature. The horse sweats, the muscles tremble or even the hindquarters can buckle. In severe cases, the horse is even immobile. The urine can also be an indication if it is dark brown to black in color.
The most you can do to help your horse is to leave him standing and keep him warm. It is important that you do not feed concentrated feed, but you should offer water. At the same time you should contact a veterinarian.