What Is an E-Collar? How Dog Shock Collars Work vs TENS Units

What is E-collar?

An e-collar, also known as an electronic-collar, remote training collar, or shock collar, is a training device that is commonly used on dogs and other animals. It is worn like a regular collar and has electronic components that enable the trainer to deliver a stimulus remotely through a handheld transmitter (remote). Some electronic collars can produce both audible tones (beeps) and vibrations.

What is E-collar?

What is Tens Unit?

A TENS unit is a medical device that doctors and chiropractors use to relieve pain. The device uses electrodes (sticky pads) to send low-voltage currents through the skin to the underlying nerves. This device is used to treat chronic pain (arthritis, back pain, neck pain), post surgery pain management, muscle or join injuries, and labor pain (during childbirth).

Can a shock collar harm my dog?

To put it simply, no. The stimulus does not result in physical harm to a dog. If used improperly (with too high intensity or poor timing), it can cause stress, anxiety, or confusion. The stimulus emitted from a shock collar (also known as an e-collar) is the same as that of a TENS unit used on humans for physical therapy. In the article below, we deep dive into a comparison of E-collars and TENS units. You might be shocked (pardon the pun) to see how similar they are.

Dog Training E-Collars and TENS Units: An Unlikely Comparison

At first glance, a dog training electronic collar (e-collar) and a TENS unit might seem worlds apart - one is for canine behavior correction and training, while the other is for human pain management. The dichotomy is that a TENS unit is an FDA-approved form of physical therapy, while the electronic collar, often referred to as a'shock collar', is considered by some to be a 'torture device', cruel, and dangerous to use. But when you dig into how they work, the similarities become hard to ignore. Both rely on controlled electrical stimulation to create a physical response, and both depend on adjusting that stimulation to suit the subject.

Dog E-Collars vs TENS Units

The Core Mechanism: Electrical Stimulation

  • Dog E-Collar: uses contact points on the dog's neck to deliver a mild electrical stimulus, which triggers nerves in that area of the dog's body. The goal is to interrupt a behavior or gain the dog's attention without causing harm.
  • TENS Unit: Sends electrical pulses through electrodes on the skin to stimulate nerves. The goal is to reduce pain or relax muscles by altering nerve signal patterns.
  • Common ground: Both devices produce a non-lethal electrical stimulus, a low-amperage electrical signal applied through the skin to achieve a specific behavioral or physiological effect.

Adjustable Intensity Levels

  • Dog E-Collar: Modern dog collars offer a broad selection of stimulation levels - from barely perceivable to powerful - to match the dog's size, temperament, and responsiveness.
  • TENS Unit: Has settings to control pulse intensity, frequency, and duration. The user can start with a mild sensation and increase it as needed.
  • Common ground: Precision in control is key. Dogs and humans may experience distress or discomfort if overstimulated, while too little may not produce the intended response.

Sensory Experience

  • Dog E-Collar: Dogs typically feel it as a tingling or tapping sensation at low levels, escalating to a strong but brief stimulus at higher levels.
  • TENS Unit: Users often describe a tingling, buzzing, or muscle-twitch sensation, depending on the application.
  • Common ground: Both create sensory input designed to be noticeable but safe when used correctly.

Application Sites

  • Dog E-Collar: Placed around the neck, with contact points touching the skin through the fur.
  • TENS Unit: Electrode pads can be placed anywhere on the body near the target nerve or muscle group.
  • Common ground: Placement directly affects how the stimulation feels and how effective it is. The stimulus is targeted to that region of the dog or human's body.

Purpose and Conditioning

  • Dog E-Collar: The purpose is behavioral conditioning — teaching a dog to avoid certain behaviors or respond to commands.
  • TENS Unit: The purpose is physical conditioning — helping muscles relax or nerves calm to reduce pain.
  • Common ground: Both are tools, not magic fixes. Effectiveness depends on proper application, timing, and technique.

Misuse Risks

  • Dog E-Collar: Misuse (too high intensity, poor timing) can cause stress, anxiety, or confusion.
  • TENS Unit: Misuse (excess intensity, incorrect placement) can cause discomfort, muscle fatigue, or skin irritation.
  • Common ground: Both require user education to ensure safety and effectiveness.


Dog E-Collar and a TENS unit are cousins in the world of electrical stimulation technology

Bottom Line

A dog training collar and a TENS unit are cousins in the world of electrical stimulation technology. The hardware principle — low-level, adjustable electric pulses applied through skin contact — is essentially the same. The difference lies in the purpose: one conditions behavior in animals, the other manages pain in humans.

If used correctly, both can be safe and targeted tools. Used carelessly, both can cause unnecessary distress. The principle is straightforward: controlled electricity can affect biology, whether it's a dog learning boundaries or a human finding relief from pain.

While tools like e-collars and TENS units can influence training outcomes, nothing replaces professional guidance. Our Dog Training Camp and Puppy Camp in Minnesota provide hands-on, safe, and effective programs tailored to your dog's unique needs.