I used to use such a device so that my dog would not leave the yard in order to produce offspring, but I decided that this is a very cruel way. Therefore, in order to protect my dog from all sorts of diseases, I decided to spay it. After reading about spaying for dogs , I learned that neutered dogs are kinder, they make fewer mistakes than other dogs, and rarely mark their territories and they have no goal to leave the territory to walk with other dogs and bring offspring.