Section: Behavior

Scratching Dogs Ears Gets Them High

Every dog owner has witnessed the curious phenomenon: you gently scratch the base of your dog's ear, and their leg begins to thump rhythmically, their eyes glaze over, and they lean into your hand with a look of pure bliss. This reaction is so predictable and peculiar that it has spawned a popular phrase: "scratching dogs ears gets them high." But is there any veterinary truth to this claim? Does your dog experience a literal "high" from an ear scratch, or is this simply an over-interpretation of a basic neurological reflex?

This comprehensive veterinary pillar article will dissect the science behind the ear scratch response. We will explore the neuroanatomy of the scratch reflex, the physiological release of endorphins (the body's natural "feel-good" chemicals), and the critical distinction between a pleasurable sensation and a clinical sign of disease. We will also provide regionally relevant guidance for owners in North America, Europe, and Australia on how to differentiate between a happy dog and one suffering from an ear infection, allergy, or parasitic infestation.

Quick Q&A

Question: Does scratching my dog's ears actually get them high like a drug?

Answer: While not identical to a drug-induced "high," scratching your dog's ears triggers a complex neurological reflex (the scratch reflex) that stimulates nerve endings and can prompt the release of endorphins, the body's natural pain-relieving and pleasure-inducing hormones. This creates a sensation of deep relaxation and euphoria, which is why dogs often seek out and thoroughly enjoy ear scratches. However, persistent scratching or a negative reaction to ear touch can indicate an underlying medical issue such as otitis externa (ear infection) or atopic dermatitis.

The Neurological Basis: Understanding the Scratch Reflex

The phenomenon commonly described as "getting high" from an ear scratch is, in veterinary neurology, known as the scratch reflex or pinnal-pedal reflex. This is an involuntary, spinal-mediated reflex arc. When you scratch a specific area on a dog's body, particularly the ear flap (pinna) or the saddle region (flanks and lower back), sensory nerves in the skin are stimulated.

How the Reflex Arc Works

  1. Stimulation: Your fingernails or gentle pressure activate mechanoreceptors (touch receptors) in the skin of the ear.
  2. Afferent Pathway: The sensory signal travels via the dorsal root ganglion to the spinal cord.
  3. Spinal Integration: The signal synapses within the spinal cord, often bypassing the brain initially. This is a polysynaptic reflex, meaning it involves multiple interneurons.
  4. Efferent Pathway: A motor signal is sent back to the muscles of the hind leg (primarily the quadriceps and hamstrings) causing the characteristic rhythmic kicking or scratching motion.

This reflex is a remnant of a protective mechanism designed to dislodge parasites, irritants, or debris from sensitive areas. The fact that it feels pleasurable is an evolutionary bonus, encouraging the animal to repeatedly engage in behaviours that keep the skin and ears healthy.

The "High": Endorphins, Oxytocin, and the Pleasure Pathway

So, does scratching a dog's ear literally get them high? From a neurochemical perspective, the answer is a qualified yes. While dogs do not experience a psychoactive "high" in the human sense of drug intoxication, they do experience a significant release of endorphins and oxytocin.

Endorphin Release

Endorphins are endogenous opioid peptides that act as natural painkillers and mood elevators. They bind to the same mu-opioid receptors in the brain that are targeted by morphine and other opioid drugs. When you scratch a pleasurable spot on your dog, the sustained, rhythmic stimulation activates these receptors.

  • Pain Relief: Endorphins can reduce the perception of minor discomforts, such as a mild itch or muscle tension.
  • Euphoria: The binding of endorphins to opioid receptors in the brain's reward centers (e.g., the nucleus accumbens) produces a feeling of well-being, calm, and mild euphoria.
  • Stress Reduction: Endorphins help lower cortisol (the stress hormone) levels, promoting a state of relaxation.

Oxytocin and Bonding

The act of grooming and being groomed is a powerful social bonding mechanism in canids. When you scratch your dog's ear, the physical contact and gentle pressure also stimulate the release of oxytocin, often called the "love hormone" or "cuddle hormone." Oxytocin is released in both the dog and the human during positive interactions, strengthening the human-animal bond. This neurochemical cocktail of endorphins and oxytocin creates a deeply rewarding experience, which is why your dog will actively solicit ear scratches and why you enjoy giving them.

Clinical Significance: When Ear Scratching is a Problem

The phrase "scratching dogs ears gets them high" is almost always used in a positive context. However, from a veterinary perspective, it is crucial to distinguish between a pleasurable, voluntary interaction and a compulsive or pain-driven behaviour. If your dog is constantly scratching their own ears, rubbing them on the floor, or shaking their head, this is not a sign of a "high." It is a sign of pruritus (itching) or pain due to an underlying medical condition.

Common Medical Causes of Ear Pruritus

  • Otitis Externa (Ear Infection): This is the most common cause. It can be bacterial, fungal (yeast, typically Malassezia pachydermatis), or mixed. Signs include redness, swelling, discharge (brown, yellow, or black), and a foul odour. According to the Merck Veterinary Manual, otitis externa is a multifactorial disease often driven by underlying allergies.
  • Atopic Dermatitis (Environmental Allergies): Allergies to pollens, dust mites, or moulds are a primary cause of ear inflammation. In many dogs, the ears are the first and most severely affected site. The AVMA notes that atopic dermatitis is a lifelong condition requiring multimodal management.
  • Food Allergies: Adverse food reactions often manifest as pruritic skin and ear disease. A strict elimination diet trial, as recommended by the AAHA, is the gold standard for diagnosis.
  • Parasites:
    • Ear Mites (Otodectes cynotis): Highly contagious, especially in puppies and multi-pet households. They cause intense pruritus and a characteristic dark, crumbly discharge resembling coffee grounds.
    • Ticks: Ticks can attach to the ear flap or inside the ear canal, causing local irritation and potential for tick-borne disease (e.g., Lyme disease in North America and Europe, Ehrlichiosis in Australia).
  • Foreign Bodies: Grass awns (foxtails, spear grass) are a notorious problem, particularly in Australia and the Western United States. These sharp seeds can migrate deep into the ear canal, causing sudden, severe head shaking and pain. The AVA and DAFF frequently warn about the dangers of grass awns in dogs.
  • Polyps or Tumours: Masses within the ear canal can cause secondary infections and discomfort, leading to scratching.

Regional Disease Considerations

  • North America (US/Canada): Atopic dermatitis and secondary yeast/bacterial infections are extremely prevalent. Tick paralysis from Dermacentor species can also present with ear-related signs.
  • Europe (FVE/EFSA region): Otodectes cynotis is a common parasitic cause. Leishmaniasis (in Mediterranean regions) can also cause skin and ear lesions.
  • Australia (AVA/DAFF): Grass awn migration is a leading cause of acute, severe otitis externa. Paralysis ticks (Ixodes holocyclus) can attach to the ear, causing local irritation and systemic toxicity.

How to "Scratch" Safely: A Guide for Owners

If your dog is healthy, ear scratching is a wonderful bonding activity. However, it must be done correctly to avoid causing harm or masking a medical problem.

The Safe Ear Scratch Technique

  1. Start Externally: Begin by gently rubbing the base of the ear flap (the pinna) between your thumb and forefinger. This is the area that typically triggers the pleasurable reflex.
  2. Observe the Response: A happy dog will lean into your hand, sigh, and may exhibit the scratch reflex (leg kicking). A dog in pain will pull away, whimper, or show the whites of their eyes (whale eye).
  3. Avoid the Canal: Do not insert your fingers or any object (cotton swabs, Q-tips) into the vertical or horizontal ear canal. This can push debris deeper, damage the delicate lining, and cause pain or infection. The Cornell College of Veterinary Medicine strongly advises against using cotton swabs in the ear canal.
  4. Check for Odour: After scratching, smell your fingers. A healthy ear has little to no odour. A yeasty, musty, or foul smell is a classic sign of infection.
  5. Use a Proper Cleaner (If Needed): If your veterinarian recommends routine ear cleaning, use a veterinary-approved ear cleaning solution. Apply the solution to a cotton ball or gauze pad and wipe the visible parts of the ear flap and the opening of the canal. Never use alcohol or hydrogen peroxide, as these can be irritating.

The "Pinnal-Pedal Reflex" as a Diagnostic Tool

Veterinarians use the pinnal-pedal reflex as a clinical test. A strong, easily elicited reflex can be normal. However, an exaggerated reflex or one that is elicited by very light touch can be a sign of hyperesthesia (increased skin sensitivity) associated with conditions like:

  • Cervical (Neck) Pain: Intervertebral disc disease (IVDD) or other spinal issues.
  • Polyneuropathy: Diseases affecting multiple nerves.
  • Severe Pruritus: The skin is already sensitized from chronic inflammation.

If your dog shows an exaggerated response (e.g., kicking violently, crying, or trying to bite you) when you touch their ear, it warrants a veterinary check-up.

Behavioural and Welfare Implications

Understanding that ear scratching can produce a "high" has implications for animal welfare and behaviour.

  • Positive Reinforcement: The neurochemical reward (endorphins + oxytocin) makes ear scratches a powerful, non-food-based reinforcer for training. You can use a gentle ear scratch as a reward for calm behaviour or successful commands.
  • Stress Relief: For anxious dogs, a gentle ear massage can be a valuable tool for stress reduction. The release of oxytocin helps lower heart rate and promote a sense of safety. This is supported by general principles of low-stress handling advocated by the CVMA and AAHA.
  • The "Happy Tail" vs. The "Painful Ear": It is vital for owners to learn the difference. A dog that solicits ear scratches and then shows a relaxed, "melty" body posture is experiencing a positive state. A dog that avoids ear contact, shakes its head, or scratches its own ears obsessively is likely in discomfort. Ignoring this distinction can lead to delayed treatment for painful conditions like chronic otitis.

When to Consult a Veterinarian

You should schedule a veterinary appointment if you observe any of the following:

  • Persistent Head Shaking: More than a few times per hour.
  • Scratching at Ears: Using hind paws to scratch the ears repeatedly.
  • Rubbing Ears on Furniture or Floor: A classic sign of pruritus.
  • Redness or Swelling: Inside the ear flap or at the canal opening.
  • Discharge: Any colour or consistency (brown, black, yellow, green, bloody).
  • Foul Odour: A "yeasty" or "sour" smell is abnormal.
  • Pain: Yelping, flinching, or growling when the ears are touched.
  • Head Tilt or Loss of Balance: These can indicate a middle or inner ear infection (otitis media/interna), which is a medical emergency.

Your veterinarian will perform an otoscopic examination to visualize the ear canal and eardrum. They will likely take a cytology sample (swabbing the ear and looking at the discharge under a microscope) to identify bacteria, yeast, or mites. This is the cornerstone of diagnosis, as per DVM360 clinical guidelines. Treatment will be tailored to the underlying cause, which may include topical or systemic antibiotics, antifungals, anti-inflammatories, or parasiticides.

Conclusion

The idea that "scratching dogs ears gets them high" is a charming and surprisingly accurate layperson's description of a real neurochemical event. The combination of the spinal scratch reflex and the release of endorphins and oxytocin creates a genuine state of pleasure, relaxation, and bonding for your dog. This is a normal, healthy, and beneficial interaction that strengthens the human-animal bond.

However, this phenomenon exists on a spectrum. What begins as a pleasurable scratch can quickly become a sign of distress if an underlying medical condition is present. Responsible pet ownership requires being able to distinguish between the blissful leg-kick of a healthy dog and the frantic scratching of an itchy, painful ear. By understanding the science behind the "ear scratch high" and remaining vigilant for signs of disease, you can ensure that every ear scratch you give is a safe, loving, and truly rewarding experience for your canine companion.

References

  1. Merck Veterinary Manual. (2023). Otitis Externa in Dogs and Cats. Kenilworth, NJ: Merck & Co., Inc.
  2. American Veterinary Medical Association (AVMA). (2021). Allergies in Dogs and Cats. Schaumburg, IL: AVMA.
  3. American Animal Hospital Association (AAHA). (2020). AAHA Canine Life Stage Guidelines. Lakewood, CO: AAHA.
  4. Cornell University College of Veterinary Medicine. (2022). Ear Infections in Dogs. Ithaca, NY: Cornell University.
  5. VCA Animal Hospitals. (2023). Ear Scratching in Dogs. Los Angeles, CA: VCA, Inc.
  6. Australian Veterinary Association (AVA). (2022). Grass Seeds and Your Pet. St Leonards, NSW: AVA.
  7. Federation of Veterinarians of Europe (FVE). (2021). Responsible Pet Ownership Guidelines. Brussels, Belgium: FVE.
  8. DVM360. (2019). A Step-by-Step Approach to Canine Otitis Externa. Intellisphere, LLC.
  9. Overall, K. L. (2013). Manual of Clinical Behavioral Medicine for Dogs and Cats. St. Louis, MO: Elsevier. (Discusses neurochemistry of bonding and handling).
  10. Beaver, B. V. (2009). Canine Behavior: Insights and Answers. St. Louis, MO: Saunders. (Discusses sensory systems and reflexes in dogs).