A video of a dog smacking his lips before going to sleep has melted the internet's heart.

During the TikTok clip shared to @kobethelittleshiht, an account dedicated to Kobe the shih tzu, he can be seen resting his eyes. But before taking a well-deserved nap, he makes a noise described as "one of the best sounds" in the on-screen text.

This is followed by the phrase, "If you know, you know," and it seems many other users do as the December 2 clip has quickly gone viral.

Racking up 1.9 million views and more than 227,000 likes, many users have commented to say their dog does the same thing.

One comment said, "Mine does it when he's comfy and he's about to fall asleep," and another wrote, "My shih tzu does the same thing, and then the sigh as if he's had a long day."

"So cute. [But] if that was my hubby making that noise I'd punch him," joked a third commenter.

While this particular noise has been dubbed as special, there are other noises a brachycephalic dog—breeds with short skulls and flat faces—may make that are a cause for concern.

BOAS (Brachycephalic Obstructive Airway Syndrome)

BOAS is a condition affecting brachycephalic (flat-faced) dog breeds, such as shih tzus, bulldogs and pugs. These breeds are selectively bred for their short skulls and flat faces, which can lead to severe breathing difficulties and associated health problems.

The People's Dispensary for Sick Animals (PDSA), a U.K.-based veterinary charity, has provided the following information:

Causes of BOAS:

• Narrowed nostrils: Restricts airflow, requiring dogs to pant or mouth-breathe.
• Crowded nose and throat: Excess tissue obstructs the airway, making breathing harder.
• Elongated soft palate: Blocks airflow into the windpipe, causing snuffling or snoring.
• Narrow windpipe: Breathing resembles trying to inhale through a straw; this can worsen if internal sacs in the windpipe enlarge.

Symptoms:

Symptoms may appear in puppies or develop later (two to four years old):

• Noisy breathing (snuffles or snoring)
• Difficulty breathing and disrupted sleep
• Excessive panting, even when resting
• Reduced exercise tolerance
• Heat sensitivity (prone to heatstroke)
• Difficulty eating, regurgitation or vomiting
• Cyanosis (blue-tinged skin)
• Collapse, particularly in heat or after exertion

Diagnosis:

• Based on physical examination and symptom history.
• Vets may observe symptoms after mild exercise.
• Further diagnosis might involve airway examination under anesthesia, endoscopy or MRI scans.

Importance of Awareness:

Many owners mistake the snuffles and snoring of flat-faced breeds as normal. However, these noises often signal breathing struggles, which are indicative of serious health and welfare issues stemming from selective breeding.

Owners of brachycephalic breeds should monitor their pets for symptoms and seek veterinary care for proper diagnosis and management, especially as severe cases may require surgical intervention.

Do you have funny and adorable videos or pictures of your pet you want to share? Send them to life@newsweek.com with some details about your best friend and they could appear in our Pet of the Week lineup.