Dog sleeping a lot: when is it normal and when is it a warning?

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Some dogs manage an astonishing amount of sleep during the day: a nap after a walk, another after eating, and a third simply because the sofa is comfortable. Yet when assessing a dog’s health, I do not ask only how many hours they sleep. Far more important is whether they are still themselves when awake. Sleep and lethargy are different things.

I have always watched my dogs’ habits. We walk separately, for example, but when I get ready to go out in the morning, both Faddu and Ossu wait by the door. One then stays behind while the other comes along. If one of them stopped coming to the door one day, I would notice immediately. Not because a dog must never feel sleepy in the morning, but because this would be a change from normal behaviour.

How much sleep does a dog need?

People often quote roughly 10–14 hours of sleep in 24 hours, but this is not a compulsory target for every dog. Puppies, older dogs and animals recovering from an active day may rest more. Studies use different measurement methods and living environments: a pet dog’s day differs considerably from that of a kennel or farm dog. A 2026 accelerometer study of farm dogs measured just over 11 hours of sleep a day on average, but that does not establish a universal threshold for every pet.

For me, this approximate need for sleep is also an important reason not to take my dogs everywhere all the time. They need time to rest peacefully at home.

Lying down is not always sleeping. A dog may quietly watch its surroundings, doze briefly and then react to a sound. If an activity monitor reports a lot of sleep, consider whether it distinguishes genuine sleep from limited movement. FitBark and other movement sensors provide trends, but do not replace veterinary examination or sleep diagnostics that measure brain activity.

How does lethargy differ from ordinary tiredness?

Normal tiredness is expected after a long hike, for example. The dog rests, gets up again and shows interest in familiar activities. Lethargy is more concerning: a dog may seem weak, reluctant to stand, slow to respond or uninterested in things it usually enjoys. Even if it sleeps from time to time, something is wrong while it is awake.

Look for accompanying changes: appetite and drinking, calm breathing, willingness to go outside, normal stools and urination, painful movement and pink gums. Refusing breakfast on one morning does not alone mean disease. Conversely, accepting a treat does not rule out a health problem. These are individual pieces of a larger picture.

What can change sleep and activity habits?

Age, exercise and recovery

An older dog may rest more because of uncomfortable joints, reduced muscle strength or activities that now tire it more quickly. Do not simply put this down to age, though. Pain, obesity, heart or respiratory disease and endocrine disorders can substantially reduce activity. Age explains some changes but does not exclude a treatable disease. If a dog is sleepier after unusually strenuous activity following a long break, watch recovery and reduce the workload if needed.

New medication and drug interactions

Some medicines can cause sleepiness; others affect heart rate, blood pressure, fluid balance or digestion. If a dog becomes markedly lethargic after starting a new medicine, contact the prescribing veterinarian. Do not independently stop heart, epilepsy or hormonal treatment merely because the dog seems tired. I stress this because one symptom can have several explanations, including the illness for which the medicine was prescribed. Share your observations so the veterinarian can adjust the plan if necessary.

Pain, infection and other illnesses

A dog with ear pain, dental problems, fever, anaemia or digestive trouble may lie down instead of joining usual activities. Limping, vomiting, diarrhoea or increased drinking may occur as well. Drowsiness after heatstroke, sudden breathing difficulty, weakness or altered consciousness are not things to simply watch at home for a day. They require emergency veterinary care. We also describe heat-related warning signs in our article Heatstroke.

Stress, a new home and losing a companion

A dog arriving in a new home needs time to settle. Fear and uncertainty can make it quieter and less playful, but can also disturb sleep. A close canine companion’s death may change eating, resting, movement around the home and seeking the owner. Calm routines and familiar activities help, but marked tiredness, loss of appetite or pain should not automatically be attributed solely to grief.

Can an activity monitor help spot a problem?

Yes, especially by showing a trend. If the dog’s daily rhythm has been similar for weeks and the data suddenly changes substantially, that is a good reason to investigate. But a sensor alone cannot show the cause. It may classify motionless wakefulness as sleep or interpret collar position as activity. Research is improving the distinction between sleep and movement, but monitoring at home still combines technology with an owner’s attention.

FitBark has one particularly useful function: if my dog has rested more than usual for several days, including both sleeping and lying down in the sensor’s estimate, the app asks me: “Faddy is resting more than usual. Is he ok?” That makes me ask what has changed.

I also saw that notification before Faddu’s heart disease was diagnosed. Since treatment started, FitBark has not asked me the same question again. This does not prove that the monitor detected heart disease or that treatment alone caused the change, but an activity monitor can notice changes we owners miss.

When should you contact a veterinarian?

If an active dog becomes substantially less active over a day or two without an obvious reason, arrange a veterinary check. Contact the veterinarian sooner if the change comes with refusing food, repeated vomiting, suspected fever, pain or rapid weight change. If the dog collapses, struggles to breathe, is very weak, has pale gums or may have been poisoned, seek emergency help immediately. Do not wait 24 hours simply because the original question was about sleep.

For a discussion about longer-term increases in sleep, record when the change began, the usual number of walks, any loss of interest in play, medicines and interrupted night-time sleep. This context helps find the cause.

FendaF’s practical recommendation

During an ordinary week, note three stable habits: when your dog volunteers for a walk, how it eats and what it does after resting. An activity monitor is not essential. If a dog that used to wait by the door for walks suddenly does not get up, investigate what changed. If weakness, breathing problems, collapse or suspected poisoning occur, seek veterinary help immediately.

Conclusion

I would never want to deny a dog the pleasure of a good nap. The question is not whether it sleeps for 11, 13 or 15 hours. It is whether it feels well when awake, whether rest is restorative and whether normal life continues. I know my own dogs best through their small daily rituals. Sometimes these provide more precise early signs than any general table of sleep hours.

Sources

• Study of daytime activity and sleep in pet and laboratory dogs (2022)
• Sensor-based measurement of canine sleep and activity (2024)
• Accelerometer study of farm dogs’ sleep and rest (2026)
• Devereux et al. (2025): sleep in veterinary intensive care
• Cornell: dangerous signs of heatstroke in dogs