Perhaps the greatest benefit is the freedom it provides dog and human. A dog can enjoy being off leash while at the same time the owner has the peace of mind of guaranteed recall. So no matter the distraction -- deer, squirrels, other dogs or people -- the owner can call his dog back to safety. It brings a new level of joy to any walk on the beach or hike in the woods and can be taught in a matter of days to any dog regardless of age or breed.
Modern Philosophy For dogs with behavioral issues, the eCollar is incredibly helpful in working through issues of anxiety, stress, nervousness, and fear. There's an immediacy of communication that the eCollar provides that is faster and more effective than verbal, leash, or physical touch. A dog is first trained what the sensation of the eCollar means. Just as humans understand what a tap on the shoulder means, the dog learns that the tap of the stimulation means to turn and look at his handler. It really is that simple.
For a nervous dog to get clear input from his handler the moment he begins to show signs of being nervous means his level of stress can be effectively managed by the handler and never gets to the point of overtaking him. In dog training, specifically dog behavior rehabilitation, this is very important. It means that the trainer can inhibit the unhealthy behavior patterns and start to lay foundation for new behaviors in front of the same stimuli.
Modern Technology Just like humans, dogs can hear more easily when they're relaxed and in a quiet setting. Conversely, they can't hear well at all when surrounded by high levels of distraction. Just think to the last concert you went to and how loudly you had to yell at your friends just so they could hear you. This is where the advanced technology comes into play. Modern eCollars have 100's of levels of stimulation where earlier versions had 6 to 10. The absolute high and low aren't different between the two generations, it's the incremental levels in between that give modern collars such a huge advantage. In very practical terms, imagine your dog was off leash and getting very excited about a deer further out and you needed to call him back to you. With a modern eCollar you would have a wide range of stimulation levels to choose from to use the level high enough (or "loud" enough) to get his attention but not so high that he'd feel uncomfortable and not so low that he couldn't feel it at all.
When rehabilitating dog behavior, the benefit of applying precisely the right level of stimulation is even more meaningful. Successful rehabilitation takes in many variables including the dog's temperament, the behavioral issue itself, and the context of any given moment in training. These variables inform the trainer how much pressure to apply to the dog as he moves him through the rehabilitation process. Applying just the right pressure -- not too high and not too low -- is the difference between successful training and not. The modern eCollar with its wide range of stimulation (or pressure) gives a trainer a very effective tool because of its ability to dial up or down the intensity based on what the dog needs in a specific moment in time.