Why does my dog sleep with their tongue out?

Dogs have a lot of adorable quirks, but one that often catches pet parents by surprise is seeing their furry friend snoozing peacefully with their tongue hanging out. It’s undeniably cute, but it also raises questions: Is it normal? Is it something to worry about? Or is it just another one of those lovable doggy habits?

The good news is that in most cases, dogs sleeping with their tongues out is completely harmless. But, as with any behavior, context is key. In this detailed guide, we’ll explore every reason behind this behavior, dive into expert insights, and help you understand when it’s normal and when it might be time to call the vet.

Understanding Canine Sleep Behavior

The Stages of Dog Sleep

Just like humans, dogs cycle through different stages of sleep. These include light sleep, deep sleep, and REM (Rapid Eye Movement) sleep. It’s during REM sleep that your dog might dream, twitch, and, yes—let their tongue slip out of their mouth. As muscles relax completely, the tongue may naturally slide out.

Normal vs Abnormal Sleep Habits

While tongue-out sleep is typically a sign of deep relaxation, abnormal signs like excessive drooling, tongue swelling, or discoloration during sleep can indicate an issue.

7 Common Reasons Why Dogs Sleep with Their Tongue Out

1. They’re in Deep Relaxation

When dogs fall into a deep, restful sleep, their jaw muscles relax. This muscle relaxation allows the tongue to naturally flop out of their mouth. It’s a sign that they’re content and comfortable.

2. Breed-Specific Characteristics

Some breeds are more prone to this behavior. For example, brachycephalic dogs (like Bulldogs, Pugs, and Shih Tzus) have shorter snouts and shallower mouths, which means there’s less room for their tongue.

3. Dental Issues or Missing Teeth

Missing teeth, especially front incisors or canines, can result in less support for the tongue, allowing it to fall out more easily. This is more common in senior dogs or those with poor dental hygiene.

4. Natural Cooling Mechanism

Dogs don’t sweat like humans. Instead, they regulate body temperature through panting. Sleeping with their tongue out can help them cool down during warmer nights or naps in the sun.

5. Age-Related Muscle Relaxation

Senior dogs often experience decreased muscle tone, which can make it harder to keep their tongue in place. As they age, their body relaxes more, and their sleeping habits may change.

6. Medication or Sedation

Some medications, especially sedatives or anesthetics, can cause temporary muscle relaxation or drowsiness that affects how your dog sleeps, including how they hold their tongue.

7. Neurological Conditions

In rare cases, neurological disorders can cause involuntary muscle movements or loss of muscle control. If your dog suddenly starts sleeping with their tongue out and also displays other unusual behavior, consult your vet immediately.

Should You Be Concerned If Your Dog Sleeps With Its Tongue Out?

When It’s Completely Normal

• The behavior is occasional and your dog otherwise seems healthy

• It only occurs during deep sleep

• There’s no excessive drooling or signs of discomfort

Signs It May Be a Health Issue

• Persistent tongue protrusion even when awake

• Signs of oral pain or infection

• Difficulty eating or drinking

• Change in behavior or lethargy

Expert Opinions on Dogs Sleeping with Their Tongue Out

Veterinarians and canine behaviorists have weighed in on this quirky behavior.

Dr. Marty Becker, a well-known veterinarian and author, explains:
“When dogs are deeply relaxed—especially during REM sleep—their entire body loosens up, including the jaw. If their tongue falls out, it’s just a sign that they’re completely at ease.”

Dr. Krista Williams, DVM, adds:
“Dogs with missing teeth or short snouts may be more likely to sleep with their tongue out. It’s usually harmless but keep an eye out for other signs like excessive drooling or swelling.”

How to Monitor Your Dog’s Tongue Behavior During Sleep

Keeping an eye on your dog’s sleeping habits is one of the best ways to ensure they’re healthy and happy.

Keeping a Sleep Journal

Start by noting how often your dog sleeps with their tongue out. Is it every night or just once in a while? Track other behaviors like snoring, twitching, or vocalizing in their sleep. These clues can help your vet better understand any potential issues.

What to Record and When to Seek Help

Write down the duration of tongue exposure, whether it happens during naps or nighttime sleep, and any accompanying signs like labored breathing or changes in gum color. If your dog seems uncomfortable or the tongue is dry, cracked, or swollen, it’s time to contact your vet.

When to Visit the Vet: Red Flags to Watch For

While most cases are nothing to worry about, certain signs can signal an underlying issue that needs veterinary attention.

Unusual Drooling

A little drool is okay, especially during hot weather, but if your dog is drooling excessively while sleeping with their tongue out, it might be due to dental pain, nausea, or an oral infection.

Swelling or Discoloration

If the tongue appears bluish, purple, or very pale, it may indicate poor circulation or respiratory problems. A swollen tongue can also be a sign of an allergic reaction, especially if it appears suddenly.

Persistent Tongue Protrusion

If your dog’s tongue hangs out even when they’re awake and alert, this could indicate nerve damage or a condition called “hanging tongue syndrome,” which is more common in toy breeds or dogs with jaw injuries.

Connection Between Sleep Position and Tongue Protrusion

The way your dog sleeps can greatly influence whether their tongue stays in or slips out.

Why Certain Sleep Styles Encourage Tongue-Out Behavior

Dogs who sleep on their side or back tend to experience more muscle relaxation, which makes it more likely for their tongue to droop out. On the other hand, dogs that curl up tightly may be less prone to this habit because the jaw remains more tensed.

Dental Health and Its Role in Tongue Protrusion

Good dental hygiene isn’t just important for fresh breath—it also plays a huge role in how your dog’s mouth functions during sleep.

How Tooth Loss Affects the Jaw and Tongue

When dogs lose teeth, especially front ones, the structure of the mouth changes. Without teeth to hold it in, the tongue may naturally drift out during sleep. This is especially common in older dogs and those with a history of periodontal disease.

Oral Hygiene Tips

• Brush your dog’s teeth daily or use dental wipes

• Schedule professional dental cleanings with your vet

• Provide safe chew toys that help reduce plaque

• Monitor for signs of dental discomfort like pawing at the mouth or refusing food

How Age Affects a Dog’s Tongue and Sleep Habits

Aging affects all systems in your dog’s body, including muscles and nerves, which in turn can impact their sleep habits.

Puppies vs Senior Dogs

Puppies are less likely to sleep with their tongue out because their muscles are tighter and they usually have a full set of healthy teeth. As dogs age, their muscles, including those around the jaw and tongue, begin to relax more, and this can lead to tongue protrusion during sleep.

What’s Normal at Different Life Stages

• Young Dogs: Rare to see tongue hanging out unless they’re extremely relaxed

• Adult Dogs: May show this behavior occasionally, especially in warm weather or after exercise

• Senior Dogs: Most likely to display this due to muscle relaxation and tooth loss

Impact of Medication or Sedation

Dogs on certain medications may be more prone to letting their tongues hang out during sleep.

Temporary Muscle Relaxation

Sedatives and anesthesia can cause dogs to sleep more deeply and lose muscle tone temporarily, making tongue protrusion more likely. This should resolve as the medication wears off.

When It Becomes a Concern

If the tongue stays out long after your dog has recovered from medication, or if other signs like drooling or lethargy are present, consult your vet.

Can Neurological Disorders Be the Cause?

Although rare, some neurological conditions can cause dogs to lose control of their tongue muscles.

Understanding the Link

Issues like facial nerve paralysis or damage to the brainstem can lead to tongue protrusion. These conditions often present with other signs like drooping of the eye, head tilt, or lack of coordination.

Diagnosis and Treatment

If your vet suspects a neurological issue, they may refer you to a veterinary neurologist for further evaluation, which may include MRI or blood tests. Treatment will depend on the root cause.

Do Certain Dog Breeds Sleep with Tongues Out More Often?

Yes, some breeds are more prone to tongue-out sleeping than others.

Brachycephalic Breeds

Dogs like Pugs, Bulldogs, and Boxers have flat faces and small jaws, which give the tongue less room to stay tucked in, especially during sleep. Their anatomy naturally encourages tongue exposure.

Small Breeds with Shallow Mouths

Chihuahuas, Yorkies, and Maltese also often sleep with their tongues out. These breeds may have smaller mouths and a higher tendency toward dental issues that contribute to this behavior.

Tips to Ensure Your Dog Sleeps Comfortably

A comfortable sleep environment reduces the likelihood of any stress-induced behaviors and ensures better rest.

Optimal Bed Positioning

Choose a supportive bed that lets your dog lie in their favorite position. Orthopedic beds are great for senior dogs.

Managing Room Temperature

Keep the sleeping area cool and well-ventilated. Dogs sometimes sleep with their tongues out to cool down, so managing heat helps reduce unnecessary tongue exposure.

FAQs: Why Dog Sleep with Tongue Out

1. Is it normal for dogs to sleep with their tongue out?

Yes, it’s a common and usually harmless behavior, especially in relaxed or older dogs.

2. What does it mean if my dog’s tongue is out while they’re awake too?

It could be due to dental issues, hanging tongue syndrome, or a neurological problem. Check with your vet.

3. Do puppies do this too?

It’s less common in puppies since their muscles are tighter and dental structure more intact.

4. Should I try to put the tongue back in?

No need, unless the tongue looks dry, swollen, or discolored. Forcibly moving it may cause discomfort.

5. What breeds are most likely to sleep this way?

Brachycephalic breeds like Bulldogs and small breeds like Chihuahuas often sleep with their tongue out.

6. Can sleeping with the tongue out cause health issues?

Not typically, but it can sometimes dry out the tongue. If you notice cracking or bleeding, consult a vet.

Conclusion: Embracing Your Dog’s Quirks

Dogs are full of fascinating, lovable behaviors, and sleeping with their tongue out is one of the cutest. For most pets, it’s just a sign that they feel safe, relaxed, and utterly content in your home. As long as your dog shows no signs of distress or illness, there’s no need to worry. Just enjoy the charm of your tongue-lolling, snoring buddy. After all, these little quirks are what make them so endearing.