6 month old lab pup, Tritronics bark limiter with lowest plug, 1st club training day. Pulled onto grounds, collar on dog, and parked by barking dogs. My dog barked twice with mild yips at end of each bark, and that was it. No more barking. I've been told some dogs will learn to whine as that doesn't activate the collar, so bleed off that energy with walks, airing, and work vs. leaving them to learn whining as an outlet. For me, barking at home in response to doorbell is OK (cheap alarm system) so no collar at home. Use selectively as your standards dictate.