A toro embolado (in Spanish), bou embolat (in Catalan), roughly meaning bull with balls, is a festive activity, typical of many towns in Spain (mainly in the Valencian community and Southern Catalonia), in which a bull that has balls of flammable material attached to its horns, which are set on fire, is set free in the streets at night, and participants dodge the bull when it comes close. It can be considered a variant of an encierro (correbous in Catalan). This activity is held in a number of Spanish towns during their local festivals. In recent years, animal welfare activists have attempted to stop this practise from happening due to the cruelty to the animal.
The animal is usually tied to a post and then teams of people prevent it from moving while a wooden frame with two spikes with balls of flammable material is attached to its horns. These are then set alight and the rope is cut. Sometimes fireworks are attached too, which then go off shortly afterwards. There is usually a barricade separating the bull from the spectators.
A somewhat similar activity is the Toro de fuego, in which the live bull is replaced by a bull-resembling metal frame (held by a runner) which is set alight.