Abstract: A device for repelling potentially bulling cattle is described. This invention addresses the problem of the mounting and/or riding of confined animals by other cattle confined in the same pen by providing a permeable container which holds a pungent smelling substance and which is easily attachable to the animal which is to be protected. This invention discourages bulling by masking the pheromones of the animal to be protected by an odor which is repellant to cattle. This invention achieves the objective of reducing or eliminating the bulling characteristics of penned bovine in a manner that is cost effective, easy to install and maintain, and which induces no health risk to the animals involved. Thereby, this invention provides, for cattle producers, substantial cost savings, both is reduction of cattle losses and management facilities and labors.