This site offers electric collars that deliver mild shocks to your animals for multiple purposes. Discovering these purposes may require a lot of unsatisfactory browsing, but the gist is that you can opt to control excessive barking (not recommended for watchdogs), lay down an invisible fence in your yard (when the dog tries to pass, the collar shocks it) or restrict the pooch’s access to certain rooms of the house even when you’re not home. Ultimately, this equipment will keep your pet out of trouble, and the ethical questions involved will delight your friends.