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Dog Behavior

Why Do Dogs Like to Sleep Curled Up? 3 Likely Reasons

Hallie Ballard
By Hallie Ballard · Reviewed & fact-checked by Dr. Paola CuevasVet Approved
Dr. Paola Cuevas
Reviewed & Fact-Checked byDr. Paola CuevasVeterinarian
Dr. Paola Cuevas is our Senior In-House Veterinarian at Dogster and Pangolia. She has over 19 years of experience working with an array of species and loves sharing her knowledge and experience with our readers and aims to provide assistance with any issue presented by your non-human family members. She received her degree from the University of Guadalajara, Mexico.View authorThe information is current and up-to-date in accordance with the latest veterinarian research. Learn more
Updated on June 17, 2026
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Brown dog sleeping outside

How many times have you watched your dog prepare for bed only to watch them curl up into a tight ball instead of spreading out? There isn’t a sleeping position that is much cuter than this one. But why do dogs often sleep this way? While there are many different positions that dogs sleep in, it’s relatively common to see them in this one, where their bodies are tightly wound into a ball. This isn’t just for comfort alone. There are some more practical reasons that dogs lie like this.

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The 3 Reasons Dogs Sleep Curled Up

1. Warmth

Both the environment and our body temperatures tend to cool down at night. When a dog curls into a ball, they can conserve some of their body heat. Think about the way that most humans sleep. Many of us tend to bundle up under blankets. Huddling for warmth is an instinct in most mammals, and this behavior has evolutionary origins. Curling into a ball reduces the amount of body surface exposed to cooler air, which helps dogs retain heat while they sleep.

Image By: ddzphoto, Pixabay

2. Security

It’d be pretty hard to fall asleep if you never felt safe. While your home is a safe place for them, and it's unlikely a predator will jump on them while they are in your home, curling into this sleeping position may help them feel safer. You’ve probably heard that dogs show their bellies when they feel comfortable. Your dog isn’t able to monitor their surroundings while they sleep, so they may lie in this position to protect their vital organs while they have their guard down. It also provides them comfort and makes them feel a little more protected.


3. Comfort

Realistically, your dog could be choosing to sleep like this simply because it feels comfortable compared to other positions. Even if there is plenty of space for them to turn around or stretch out, some will always choose to curl up because it’s the coziest. You can also provide additional comfort by giving them a soft pillow or blanket to use as a type of nest.

Image Credit: DenisDoukhan, Pixabay
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Do Dogs Sleep Curled Up When Feeling Sick?

Many dogs prefer to curl into a ball when taking a snooze. However, there are some dogs whose preferred method is to sprawl out. That’s when this behavior starts to feel strange to some dog owners.

Dogs are capable of not feeling well sometimes, just as we do. Sick dogs may occasionally curl into this position when they have an upset stomach or other types of pain and are trying to protect that area. Other signs that your dog may be sick are if they are less interested in their surroundings, seeking solitude, shivering, vomiting, having diarrhea, or sleeping more than usual. If you suspect they’re sick, take them in for a quick trip to the vet and get them feeling back to normal.

Why Do Dogs Curl Up When Lying Next to You?

If your dog sleeps in this position when they’re lying right next to you, take it as a form of flattery. The chances are that your dog feels safe and comfortable around you. Dogs are social animals and often like resting close to the people they trust. Curling up next to you can also help them stay warm and relaxed.

Image Credit: Sarah Chai, Pexels
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Summary

Dogs have their own reasons for sleeping the way they do. There isn’t anything wrong most times, and they are either comfy that way or just trying to keep warm. Instead of worrying, try to embrace how cute they look and cuddle up next to them if they’re up for it.

See also:


Featured Image Credit: michaelmehls, Pixabay

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Hallie Ballard
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Hallie Ballard

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