Is Your Dog Depressed? What the Research Actually Shows

Dogs can genuinely show low-mood, withdrawn behaviour that looks a lot like human depression — but the rigorous science on whether this is truly the same clinical condition is more nuanced than most pet articles let on, and mood or behaviour changes in dogs are very often caused by an underlying medical issue, pain, or a specific life change rather than a diagnosable "depression."

Below, we cover what vets and behaviourists actually look for, what real research has (and hasn't) found, the senior-dog differential most guides miss, and what genuinely helps.

Written by Jamie Sinclair, who writes about canine health, nutrition, and everyday care for Doggy Dailies — focused on translating veterinary research and real ingredient science into practical, honest guidance UK dog owners can use.

Table of Contents

• What Does the Science Actually Say About "Dog Depression"?
• Signs Your Dog Might Be Low in Mood
• Common Causes and Triggers
• Behavioural Low Mood vs. a Medical Cause: How to Tell
• In Senior Dogs, It Might Be Cognitive Dysfunction, Not "Depression"
• Can Puppies Get "Depressed" Too?
• Is There Such a Thing as Seasonal Affective Disorder in Dogs?
• What Genuinely Helps
• When to Get Professional Help
• FAQ
• Sources

What Does the Science Actually Say About "Dog Depression"?

It's worth being honest here, because most pet content treats "dog depression" as an established medical fact. The reality is more nuanced. Vets and behaviourists widely agree that dogs can show clusters of behaviour — reduced activity, low engagement, appetite and sleep changes — that resemble the clinical signs used to diagnose depression in humans.

But when researchers at the University of Bristol specifically tested whether dogs that spent more time "awake but motionless" also showed the kind of pessimistic thinking pattern seen in depressed humans and other depressed animals, they found no clear association between the two (Harvey et al., 2020, Applied Animal Behaviour Science).

In plain terms: the behaviours we associate with "depression" are real and worth taking seriously, but science hasn't conclusively proven dogs experience the same internal condition as clinically depressed humans — the term is used descriptively, not as a settled diagnosis.

This isn't a reason to dismiss what you're seeing in your dog. It's a reason to focus on the actual observable changes and their likely causes, rather than assuming a human diagnosis maps neatly onto your dog.

Signs Your Dog Might Be Low in Mood

• Reduced interest in play, walks, or things they used to enjoy
• Lower energy or increased time spent sleeping or lying inactive
• Changes in appetite — eating noticeably more or less than usual
• Withdrawing from you, other pets, or social interaction generally
• New destructive behaviour, like chewing or scratching at doors
• Excessive licking, pacing, or other repetitive behaviours — persistent licking specifically is covered in our guide to why dogs lick so much, and repetitive behaviours more broadly in our piece on canine hyperkinesis and ADHD-like behaviour

The key word throughout is change — it's a shift from your individual dog's normal baseline that matters, not comparing them to some generic idea of a "happy dog." A naturally calm, low-energy dog isn't depressed just for being calm and low-energy.

Common Causes and Triggers

When these changes do appear, they're usually linked to something identifiable:

• Grief or loss — the death of a companion animal or a family member's absence
• A house move or major routine change, including a new baby, a change in work schedule, or a new pet in the home
• Reduced exercise, mental stimulation, or social contact, especially in dogs left alone for long stretches
• Underlying pain or illness — covered in more detail below, and often the most overlooked cause

Behavioural Low Mood vs. a Medical Cause: How to Tell

This is genuinely the most important distinction, and the one most "is my dog depressed" advice skips over too quickly. Pain, thyroid problems, and a range of other medical conditions can all produce exactly the same picture as a purely behavioural low mood.

Because the symptoms genuinely overlap, use this as a starting point, not a diagnosis — either way, a vet visit is the right next step for anything beyond a mild, explainable dip:

In Senior Dogs, It Might Be Cognitive Dysfunction, Not "Depression"

This is worth its own section, because it's a genuinely important differential that most "is my dog depressed" content never mentions. In older dogs, withdrawal, reduced engagement, and changes in sleep or activity can be an early sign of canine cognitive dysfunction (CCD) — sometimes called dog dementia — rather than situational low mood.

This is a genuine, age-related neurodegenerative condition involving the same beta-amyloid brain changes seen in human Alzheimer's disease, and it's more common than most owners realise: estimates range from around 14–22.5% of dogs over 8 years old, rising to roughly 28% of dogs aged 11–12, and as high as 60–68% of dogs aged 15 and over (PetMD; AAHA).

Vets use the acronym DISHAA to describe the pattern: Disorientation, altered Interactions with family, Sleep-wake cycle changes, House soiling, altered Activity levels, and new or worsening Anxiety.

Crucially, research has found that dogs with more cognitive decline also tend to have more signs of pain and sensory decline, meaning CCD and physical discomfort often overlap and compound each other rather than being separate, easily distinguished problems (2023 study on cognitive decline and medical conditions in senior dogs).

There's no blood test that confirms CCD in a living dog — diagnosis is clinical, made by your vet after ruling out treatable look-alikes like thyroid disease, urinary infections, and pain. If your dog is seven or older and showing any DISHAA-pattern changes, this is worth raising with your vet specifically as a possible cognitive issue, not just "low mood."

Can Puppies Get "Depressed" Too?

Yes — puppies can show a similar low-mood picture, and it's a genuinely common, under-discussed part of bringing a new puppy home. A period of withdrawal, reduced appetite, or clinginess in the first few days after leaving their mother and littermates, or moving into a new home generally, is common.

There's real physiological evidence behind this adjustment period too: research measuring stress hormone markers in newly rehomed dogs found levels were significantly elevated in the first days in a new environment, then dropped significantly by around 7 days in (Van der Laan et al., 2023, Scientific Reports).

This gives a genuinely useful rule of thumb: a settling-in dip in the first week is normal and expected, but a puppy still showing withdrawal, poor appetite, or clinginess well beyond that window is worth a vet check rather than assuming it will resolve alone.

This matters more for younger dogs specifically, since puppies are also generally reported to adapt to new homes faster than older ones, so a puppy that isn't following that pattern stands out more.

Is There Such a Thing as Seasonal Affective Disorder in Dogs?

The Royal Kennel Club raises an interesting angle here: some owners and vets report dogs seeming lower in mood during the darker winter months, echoing seasonal affective disorder in humans.

The evidence for a true seasonal pattern specific to dogs is limited compared to the human condition, but reduced daylight hours genuinely do mean shorter walks and less outdoor time for many dogs in winter, which can plausibly contribute to lower activity and engagement regardless of the underlying mechanism.

Keeping up exercise and stimulation through the darker months is a sensible precaution either way.

What Genuinely Helps

• Consistent daily exercise appropriate to your dog's age and health, since physical activity is one of the most reliably helpful factors across the research on canine wellbeing — our guide to how much exercise your dog actually needs covers the real guidelines
• Mental stimulation — puzzle feeders, scent games, and training sessions genuinely engage a dog's mind, not just their body
• Maintaining routine, since predictability reduces uncertainty that can compound stress
• Quality time and attention, particularly if reduced owner interaction is a plausible contributing factor
• Social contact with other dogs or people, where your dog genuinely enjoys it — forcing social interaction on a dog that finds it stressful can make things worse
• Additional calming support for dogs whose low mood seems tied to stress or a recent change — our Calming Chews can be a useful supplemental part of the picture alongside (not instead of) the steps above

When to Get Professional Help

See your vet if the change is sudden, severe, or lasts more than a couple of weeks despite consistent effort at home — and always as a first step if you suspect pain, illness, or (in a senior dog) cognitive decline.

Your vet can rule out medical causes and, if needed, refer you to a clinical animal behaviourist, who can build a tailored plan; in some cases, medication may be part of that plan alongside behavioural work, but this is a vet's clinical decision, not something to pursue independently.

FAQ

Sources

• Harvey et al. (2020) — Investigating putative depression-like states in the domestic dog, Applied Animal Behaviour Science
• Van der Laan et al. (2023) — Nocturnal activity as a useful indicator of adaptability of dogs in an animal shelter and after subsequent adoption, Scientific Reports
• PetMD — Signs of Dog Dementia
• The Relationship between Signs of Medical Conditions and Cognitive Decline in Senior Dogs (2023)
• The Royal Kennel Club — Dog depression and canine seasonal affective disorder

This article is for general information only and isn't a substitute for veterinary advice. If your dog's behaviour has changed, especially suddenly, please speak to your vet to rule out a medical cause.