The argument that high level working dogs are trained with an emphasis on aversives is archaic and blatantly incorrect. Which anyone who does *any* research into dog training in the big wide world would know.
The Guide Dog for the Blind association saw a increase in pass rate in their graduating canines from 50% to 80% when they adopted a positive-based training regimen in 2005: "WHAT ARE GDB'S METHODS OF TRAINING? - Our dogs are trained with positive reinforcement methods that use high value rewards of both food and praise. An abundance of rewards, including physical and verbal affection, builds motivation, confidence and produces a happy working Guide Dog. Positive Reinforcement methods strive to make the young dog successful and prevent them from making errors. In more advanced training, dogs are given the freedom to make errors. Instructors use verbal cues and collar cues to gain the desired response, which is followed by rewards."
Many bomb sniffing dogs are also trained through positive reinforcement:
http://www.smithsonianmag.com/innovation/the-education-of-a-bomb-dog-4945104/?no-ist=&page=1
Funny enough, puppies who are eventually going to enter bomb sniffing programs are often trained in prison programs, like Puppies Behind Bars, which also advocate for positive reinforcement!
Here's a K9 Police Trainer who uses positive methods to great success!:
http://policek9.com/Resources/Articles/RewardBasedPoliceDogTraining.pdf
Here's an article about a prolific police and military training academy in the Netherlands using "science-based" (i.e. reward based or positive) methods that have reduced their training time to a whopping 1/8th of the time it used to take to train desired behaviors with corrections:
Treat Dr. Sophia Yin
And a fun quote from the above article: “If you have a punishment-trained dog, in the new situation when they are not sure what to do, they are afraid they will receive punishment, even if it is mild. Dogs just stop performing and learning slows down or stops. For the most stable dogs in stressful operational situations, its more effective to condition an animal to see the world as an environment in which something positive could occur at any moment.â€
And a tip from a Navy SEAL who trains military dogs: "Reinforce Good Behavior: "Pay your dog for doing his job. Dogs have currency the same way we do—but theirs isn't monetary. Its rewards, treats, chasing balls, affection. You need to know what motivates your dog."
Finally, a quote from the US Army website about training military dogs with positivity and rewards: "All of the dog training is based on positive reward or feedback, the epitome of the classical conditioning model developed by Ivan Pavlov. When the dogs maneuver through one obstacle successfully, they are rewarded. Then, they maneuver two obstacles and are rewarded, so training builds upon previous lessons. Iverson said that eventually, the dogs will do the entire obstacle course without a reward until the end, which is how trainers develop the dogs' instincts to want the reward."
Tl;dr - Many dogs performing real world tasks like military and police dogs are being trained with a heavy emphasis on positive reinforcement. Am I saying that corrections don't happen to these dogs? No, I'm not. However, all of these organizations (police and military) have embraced the scientific results of the last two decades, which have repeatedly proven that dogs trained with rewards and LIMA methodology (Least Intrusive, Minimally Aversive) are far more engaged and trainable. Which has resulted in dogs who are being trained more quickly, graduating programs at higher success rates and are performing their real world tasks to the highest of expectations.