A training collar used on dogs that deliver stimulation that correct unwanted behaviors and help communicate to your dog in a more effective manner what is expected of them. The modern e-collar is similar to the TENS unit used in physical therapy and does not harm a dog.
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The e-collar should fit tight, and the contact points should be on the side of the neck. It should sit higher on the neck, not as high as the prong, but a bit below. Incorrect e-collar fitting, fitting too loose and the contact points don’t touch, renders it useless.
Always contact a trainer if you are unsure how to use an e-collar. Make sure to rotate the collar so your dog doesn't get pressure sores.