Most healthy adult dogs sleep 12 to 14 hours a day, puppies sleep 18 to 20, and senior dogs often push past 16 — so the odds are your dog is completely normal. Dogs are polyphasic sleepers: they nap in short bursts all day rather than taking one long block at night, which makes it look like they are asleep constantly. The question that matters is not how many hours, but whether your dog is sleepy or lethargic. Those are different things, and the second one needs a vet.
How many hours should a dog sleep?
Use age as your baseline, then adjust for size and breed. Here is what typical looks like:
| Life stage | Typical sleep per 24 hours | What is going on |
|---|---|---|
| Puppy (under 6 months) | 18 to 20 hours | Growth and brain development; sleep is where training consolidates |
| Adolescent (6 to 18 months) | 14 to 16 hours | Wild swings between flat out and full throttle |
| Adult | 12 to 14 hours | Mostly light dozing, punctuated by real sleep cycles |
| Senior (7+ for large breeds, 10+ for small) | 16 to 18 hours | Lower stamina, often less efficient sleep, sometimes pain |
| Giant breeds at any age | Add 2 to 4 hours | Mastiffs, Newfoundlands and Danes are famously professional nappers |
Why dogs sleep more than we do
Dogs get less out of each hour of sleep than humans do. Only a small share of a dog’s sleep is REM — the deep, restorative stage — compared to roughly a quarter of ours. Because they wake easily, stay alert to sound, and sleep in short scattered chunks, they need more total hours to bank the same rest.
That twitching, paddling and muffled woofing you see is REM, and it is a good sign. Let them finish. Waking a dog mid-dream is how startle bites happen, especially with seniors whose hearing has faded.
Why is my dog sleeping more in summer?
Heat is a legitimate reason for a seasonal jump in sleep. Dogs shed heat mainly by panting, which is metabolically expensive, so on hot days they conserve energy by lying still. A dog who naps through the middle of a July afternoon and comes alive at dusk is behaving sensibly.
What is not normal in hot weather: heavy panting that does not settle in the shade, bright red gums, wobbliness, or vomiting. That is heat exhaustion territory. Our dog heat safety guide covers the thresholds, and why does my dog pant so much separates normal cooling from the panting that means trouble.
Sleepy vs lethargic: the distinction that matters
A sleepy dog gets up for the good stuff. A lethargic dog does not. That is the whole test. Rattle the leash, open the treat drawer, say the walk word. A well dog who has been sleeping for six hours will still surface for that.
Signs you are looking at lethargy rather than rest:
- Not interested in food, walks, or greeting you at the door
- Slow or reluctant to stand; struggling on stairs or slick floors
- Sleeping in new, unusual, or hidden places
- Pale gums, laboured breathing, or a distended belly
- Any of the above appearing suddenly over a day or two
Medical reasons a dog sleeps too much
The common culprits are hypothyroidism, anaemia, pain, heart disease, diabetes, tick-borne infections, and simple obesity. Hypothyroidism is one of the most frequently missed — it shows up as weight gain, a dull coat, cold-seeking, and a dog who has quietly slowed down over months. It is diagnosed with a blood test and managed with an inexpensive daily tablet.
Arthritis is the other quiet one. Dogs in chronic joint pain do not usually limp dramatically; they just stop doing things. Less stair-climbing, fewer greetings at the door, more hours on the bed. If your senior dog has “mellowed,” it is worth asking whether they have actually become sore.
How to help a dog sleep better
Rest quality matters as much as quantity. Give them a supportive bed sized so they can stretch out fully — orthopaedic foam if they are over seven or over 50 pounds — in a spot away from foot traffic. Keep a predictable schedule; dogs settle far better on a routine. And make sure they are getting genuine mental work, not just physical exercise: sniffing walks, scatter feeding and puzzle toys tire a dog in a way that a fast lap around the block does not. Our roundup of the best dog beds of 2026 goes through the orthopaedic options.
Frequently asked questions
Is it normal for my dog to sleep all day?
Largely yes, if they wake readily, eat normally, and are keen for walks. Dogs nap through the day and are naturally most active at dawn and dusk.
Why does my puppy sleep so much?
Puppies need 18 to 20 hours. Growth and learning both happen during sleep, and an overtired puppy gets bitey and frantic rather than sleepy. Enforced nap time is a real training tool.
When should I worry about my dog sleeping too much?
When the change is sudden, when they will not get up for food or a walk, or when it comes with pale gums, breathing changes, vomiting, or weight change. Call your vet.
Do dogs sleep more as they get older?
Yes — typically 16 to 18 hours. Sudden increases in a senior dog still deserve a check, since arthritis and thyroid disease are both common and both treatable.
Does my dog need to sleep in my room?
Not medically, but many dogs sleep more soundly near their people. If yours settles better in your room, that is a reasonable thing to allow.
The one thing to check while they nap
Sleepy dogs are easy dogs — right up until a door is left open. While your dog is out cold, take ten seconds to check the tag on their collar: is the phone number still current, and is the tag still legible? Faded, unreadable tags are one of the most common reasons a found dog does not make it home. We make designer acrylic NFC smart tags at Shiloh’s House — tap with any phone, no app needed for whoever finds them, details engraved on the back as a backup, made in the USA, no subscription. Biased, obviously, but the check itself is free.
Get Your Tag
A designer acrylic NFC tag that never fades — tap with any phone, engraved backup, no subscription.
