this invention is a delivery system to deliver biologics such as vaccines or chemicals such as chemosterilants , repellents , or toxicants to free - roaming or wild animals such as raccoons , dogs , or foxes , without capture or physical restraint . the biologic or chemical is placed in a water - proof ampule or capsule which is imbedded in a synthetic bait comprising attractants and other additives on a polymeric support . the product will stimulate the target species to chew sufficiently that the active agent will be expelled in the oralpharyngeal cavity , particularly against the buccal mucosa . the specific adaptations of the invention depend on the eating habits of the animal species targeted .