Let’s talk about the ways our dogs train us. We spend enormous effort teaching them to come when called and wait politely for a treat, and meanwhile a 25-pound dog has quietly conditioned us to sleep folded into two square inches at the edge of our own mattress. Call it dog-spreading: the nightly phenomenon where a dog doesn’t just join the bed but seems to expand, stiffening into immovable dead weight until you’re cornered against the wall by dawn.
The instinct is to read this as dominance, your dog “claiming” the bed, or defiance, refusing to move. It’s almost never either. Dog-spreading is a blend of three ordinary things: your dog’s individual sleep style, an ancient instinct to sleep pressed against its group, and a habit loop you accidentally built and reward every single night. Once you see it that way, the fix stops being a battle of wills and becomes a straightforward matter of consistency. So let’s take the three pieces apart, then get your bed back.
It starts with personality
The simplest layer is that dogs, like people, just have sleep styles. Some curl into a tight ball; others fling themselves out like a starfish and take up three times their footprint. Some seek out your warmth and press in; others are champion kickers who’d rather have space and take yours to get it. A lot of dog-spreading is nothing more mysterious than a dog with a sprawling sleep style sharing a surface that’s too small for two.
“Owners often ask me to fix a ‘dominance’ problem in the bedroom, and what they actually have is a sprawler with a great deal, warmth, closeness, and a soft mattress, with zero reason to give any of it up,” says Dr. Mara Chen. “There’s no power struggle. There’s a comfortable animal doing exactly what worked last night.”
Then there’s the denning instinct
The second layer is older than any individual dog. As pack animals, dogs evolved to sleep together in dens, bodies touching, which is part of why sharing our beds feels so natural to them. We also, frankly, brought this on ourselves. For most of history, dogs weren’t in human beds at all; before the 1980s and ’90s, sharing a bed with a dog often meant sharing its fleas and ticks. The rise of effective flea and tick preventatives quietly removed that barrier, and dogs moved from the backyard doghouse into the bedroom over just a couple of decades. To many owners, dogs became something like children, invited into the bed from puppyhood. So the instinct to pile in was always there; we simply made it easy to act on.
This is also why some dogs burrow under the covers rather than sprawl on top. Burrowing is almost always harmless, unless it shows up bundled with anxiety or distress signals. Certain breeds are especially committed to it. Dachshunds, bred to chase badgers down into tunnels, are wired to seek out tight, enclosed spaces, and a body built for going to ground is a body that feels safest wedged all the way down by your feet.
The part you can actually change
The third layer is the one you have leverage over: learning. Every night the bed pays off, your dog spreads out, gets warm, gets close to you, and nothing bad happens, the behavior gets a little more entrenched. That’s not manipulation; it’s just how habits form. And the good news buried in it is that a learned habit can be re-learned.
Here’s the reframe that makes it easier to act on. It is completely fine to want your bed back. Your dog typically owns a perfectly good bed and picked yours anyway, or you invited it up. If it’s waking you through the night and leaving you contorted, you’re allowed to move it, or to end the arrangement entirely. Whose bed is it, after all? The dog doesn’t have a job to get to in the morning.
Moving a sleeping dog: yes, usually
For most dogs, gently nudging them into a better position, or off the bed, is no problem at all. They’ll grumble, reposition, and fall right back asleep. The old warning about “letting sleeping dogs lie” has real exceptions worth respecting: go slow and gentle with a dog that’s elderly, in pain, or has any history of aggression, where a startle can provoke a reaction. Otherwise, a calm nudge is fine.
When there’s a growl, pay attention
One response you should never wave off is growling when you try to move your dog off the bed. A small growl can feel harmless, but around a resource as valuable as the bed, it can be the first note of resource guarding, and left unaddressed, it can escalate, especially when new people, partners, or children enter the picture.
The right move is to calmly read what’s happening and move the dog off the bed, without turning it into a confrontation. A practical technique: leave a lightweight leash on at night so you can guide the dog down without reaching for its collar, which is exactly the kind of over-the-head grab that can trigger a bite. Over time, some dogs learn that their own behavior controls the invitation, growl and the bed privilege ends, settle and it’s available. If the growling is frequent or intense, that’s your cue to bring in a qualified behavior professional rather than manage it alone.
Reclaiming the bed without guilt
Deciding to move your dog to its own spot after months of co-sleeping is not a betrayal; dogs are remarkably adaptable and can absolutely learn a new routine with a little time and consistency. A few things make the transition smooth.
If your dog already has a bed or a crate it likes, lean on it, those spots double as a safe retreat when guests or kids are around. Basic cues like “up” and “off” teach your dog which surfaces are for sleeping and which aren’t. And make the new spot genuinely appealing rather than a punishment: keep it cozy and safe, and feed meals or hand out treats there to build a happy association. A good long walk before bed helps too; a tired dog settles into new digs far more easily.
One lovely middle path a lot of owners land on: keep the bedtime closeness, drop the shared mattress. Cuddle your dog in its bed before you turn in, then send it to sleep there. Plenty of dogs come to prefer their own spot, retreating to it during storms or when they simply want to be left alone, and everyone sleeps better. If you’re losing sleep to a dog who insists on the whole mattress, you don’t have to choose between your rest and your bond. You just have to be as consistent as your dog is persistent.
What’s new since this was written
The research on co-sleeping with dogs has gotten more nuanced, and it doesn’t hand down a single verdict. Sleep-lab studies have found that many people actually sleep reasonably well with a dog in the room, and some report feeling more secure and settled for it. Sharing the actual bed is a different story: the same body of work suggests a dog in the bed tends to fragment human sleep more, with more awakenings, even when people don’t consciously notice. In other words, the dog in the doorway may help; the dog on your pillow probably costs you.
That gives dog-spreaders a genuinely appealing compromise backed by data, a dog bed on the floor beside you, or a crate in the room, may deliver most of the comfort of co-sleeping with far less of the 3 a.m. mattress war. And for any bed-related growling or guarding, the field has moved firmly toward early, positive-reinforcement intervention with a certified behaviorist, rather than the old confrontational advice, which research links to more aggression, not less.
References
- Patel, Salma I., et al. “The Effect of Dogs on Human Sleep in the Home Sleep Environment.” Mayo Clinic Proceedings, vol. 92, no. 9, 2017, 1368–1372. https://www.mayoclinicproceedings.org/article/S0025-6196(17)30498-4/fulltext
- Hoffman, Christy L., et al. “An Examination of Adult Women’s Sleep Quality and Sleep Routines in Relation to Pet Ownership and Bedsharing.” Anthrozoös, vol. 31, no. 6, 2018, 711–725. https://www.tandfonline.com/doi/full/10.1080/08927936.2018.1529354
- American Veterinary Society of Animal Behavior. “Position Statement on the Use of Dominance Theory in Behavior Modification of Animals.” Accessed July 2026. https://avsab.org/resources/position-statements/
