10+ Reasons Why You’ve Got A Lethargic Dog At Home

Whether your buddy’s an Olympic athlete reincarnated or a grade-A couch potato – it’s still pretty scary if you’ve suddenly got a lethargic dog on your hands. Lethargy in dogs is usually one of the first signs they’re struggling with a sickness, injury, infection, or just pain. (Yes, even if yours is a chill dog breed or a senior dog.)

So if you’ve noticed your dog not moving much lately, here are all the reasons why – including how you can monitor your dog’s activity to spot the signs of lethargy before they worsen. Let’s get started.

Is my dog lethargic…or just lazy?

Sometimes, when a dog isn’t moving a lot, it might just mean that you have a dog that’s on the more…well, relaxed side – temperament-wise. They may just need your help to get more active. Laziness in dogs doesn’t necessarily mean that your dog has a health issue. (Although it certainly can.) So keep an eye out if your dog is just being lazy – or if they show any other worrying signs of illness or distress.

💡Dogs tend to be creatures of habit – and they’ll mimic yours, since you’re their favorite person, after all. But luckily, even a few minutes of exercise per day can help both you and your dog built a routine that’ll set you both up for success. (Think like a 10-15 minute walk after meals to keep you both happy and healthy.)

Do I have a lethargic dog – or are they just tired?

A lethargic dog might be inactive and not show any interest in these regular activities. A tired dog might be on snooze mode – but they’ll still perk up when you call them over for, say, meals.

So before you start worrying about your dog’s sudden drop in activity, ask yourself:

• Did the two of you just have a long walk or vigorous playtime together?
• Is your dog just home from spending a day playing with other dogs – and now they just need a bit of rest?
• Is your dog very young or very old? Both puppies and senior dogs might sleep a bit more than adult dogs. But usually, once you wake them up, they should be ready to engage.

⚠️ If your dog seems both tired and uninterested in regular activities together that they’d usually be excited to be a part of – they could be experiencing lethargy.

Is my dog just lazy?

Now if you’re wondering if your dog is simply…well, lazy, there are a few possible answers.

• While young puppies are often full of energy, many adult dogs tend to slow down with time. (Especially as they reach their senior years.)
• Dogs of both sexes also tend to become less active after being neutered, but not always.
• Some dog breeds are just naturally more sedentary than others.
• If your dog becomes lazy all of a sudden, this could be a sign of sickness or injury. Make sure to see your vet if that’s the case.

💡 An Activity Tracker for dogs can help you better understand how active your dog is under normal circumstances. I.e., when they’re healthy. So you can pick up on to a change in their activity much earlier and get them to your vet for a checkup before their health takes a turn for the worse.

Dealing with a lethargic dog: What it is & how to catch it early

Sometimes, laziness in dogs may not be a normal characteristic of their age or breed. Else, it could actually be lethargy – a sign that your dog is not feeling so well.

What is lethargy in dogs?

Lethargy is the condition or quality of lacking energy; sluggishness, sleepiness, unresponsiveness or decreased interest in activity. Your dog might be showing signs of lethargy if you notice they’re no longer as excited to play fetch or go for walks – or simply stop moving all that much.

⚠️ Just as lethargy in humans can be a sign of illness, lethargy in dogs may indicate that your canine pal is unwell and might need veterinary attention.

How to catch on to your dog’s lethargy early on

Tracking your dog’s daily activity can potentially save their life. Vets even recommend keeping note of how well they’re able to keep up with you while out on a walk.¹

“Keep track of your dog’s energy levels, especially how long they are able to walk.

If you notice significant declines, it could be a sign of pain, heart disease, or other illness.”

– VCA Animal Hospitals

When to see a vet

In general, it’s best to monitor your dog’s symptoms for around 24 hours – or a day – before you head to the vet. However, if you notice any of these signs – along with general lethargy – get your dog to a vet immediately:

• Pale gums, which might indicate anemia or internal bleeding
• A refusal to eat or a reduced appetite
• Shaking, which might indicate your dog is experiencing some kind of pain
• A distended abdomen, which might be a sign of bloating or another gastrointestinal disease
• Labored breathing, which might indicate a respiratory infection
• A discolored tongue (blueish or purplish)

All of these signs indicate an emergency – and the sooner your vet can check up your dog, the better.² Your vet will perform a health check to rule out any potential illness or injury. Dogs who are lethargic may be suffering from one or more of the following health issues.

Causes of lethargy in dogs

If your dog is experiencing unusual weakness or lethargy, it could be caused by a wide range of factors – ranging from pain and medication to infection and disease. Here are some medical conditions that may cause your dog to grow more lethargic over time:

Parvovirus

The canine parvovirus affects the gastrointestinal tract. It may cause:

• Lethargy
• Loss of appetite
• Abdominal pain
• Bloating
• Vomiting
• Fever or low temperature
• Diarrhea in dogs.

Canine parvovirus is spread through contact with infected dogs or contaminated surfaces. Your dog might be more at risk of picking it up if you tend to board them frequently. (Where they’re likely to come in contact with other dogs.)

If your dog hasn’t been vaccinated yet or is under 4 months old, they’re at a higher risk of picking it up. So make sure to stay on top of their shots and keep good hygiene – both for your dog, plus picking a boarding facility that’s a clean, relatively sterile environment.

⚠️ If you suspect your dog has parvo, take them to the vet immediately. Your dog will need a diagnosis and aggressive treatment as soon as possible to make sure they recover from the virus³.

Distemper

Canine distemper is a virus that affects the respiratory, gastrointestinal and nervous system of infected dogs. It can be spread through the air and initially causes a watery, pus-like discharge from the eyes. Other symptoms include:

• A runny nose
• Coughing
• Fever
• Loss of appetite
• Vomiting

As the virus worsens and attacks your dog’s nervous system, you might observe:

• Muscle twitching and convulsions
• Your dog moving around in circles
• Salivation
• Chewing fits
• Seizures
• A thickening of your dog’s foot pads
• And even paralysis

⚠️ Distemper in dogs is often deadly; and if the dog survives they often have permanent nervous system damage⁴. Make sure to get your dog to a vet immediately if you notice any of these symptoms!

Kennel cough

This infectious bronchitis affects the respiratory system in dogs, causing them to cough. Dogs with kennel cough may also experience:

• Tiredness
• Sneezing
• A runny nose
• Wheezing
• Labored breathing
• Eye discharge

Normally, kennel cough can go away on its own; but puppies, senior or ill dogs who develop kennel cough may require treatment to prevent severe infection⁵.

Heartworms

Heartworm disease in dogs is caused by a parasitic worm that infects the heart, lungs, and blood vessels of the affected animal. Initially, your dog might have no symptoms. But over time, you might notice them coughing or breathing weirdly. If left untreated, heartworms can lead to caval syndrome which can cause organ failure and death.

Leptospirosis

Another possible cause of lethargy in dogs is leptospirosis, an infectious disease caused by the bacteria Leptospira. It affects the kidney and liver in dogs and can lead to organ failure. Here are some of its symptoms:

• Vomiting
• Fever
• Increased thirst
• Loss of appetite
• Frequent urination

⚠️ Dogs with mild infections may show no symptoms at all, but the illness typically develops quickly. Moreover, dogs with this condition may develop jaundice⁶.

Lyme disease

Lyme disease is a tick-borne illness caused by the bacteria Borrelia burgdorferi that can affect both dogs and humans. The bacteria inside a tick is transmitted into the dog’s bloodstream from a tick bite and can travel to different organs, causing illness and ongoing health issues.

The tick must be attached to the dog for 24-48 hours in order to trasmit the disease. In more serious cases, it might lead to kidney failure and serious heart and brain issues. Symptoms of lyme disease in dogs include:

• Loss of appetite
• Low energy
• Fever
• Difficulties moving
• Swelling of joints
• Discomfort and pain

Ticks can also transmit other serious bacterial diseases. Which makes tick control for dogs an absolute must for any dog parent in a tick-infested area.⁷

Chronic diseases

Chronic disease is another potential reason for lethargy in dogs. If your dog is suffering from heart or liver disease, cancer, diabetes or hypoglycemia, they will likely be lethargic and show other signs of illness.

• Senior dogs are most at risk of developing diseases such as these, which are often treated with medication, diet changes, or surgery.
• Puppies under 4 months can also develop hypoglycemia (or low blood sugar), which can cause lethargy.⁷

Again, if your dog shows signs of sickness (for example, if your dog has seizures, stops eating, drinks excessively and urinates frequently, vomits or has a fever or diarrhea), then head to your vet as soon as possible.

Medications

Different types of medications can also make your dog weak or lethargic. This includes:

• Medications prescribed to your dog from the vet or over the counter flea, tick, or heartworm products.
• Natural supplements or alternative therapies such as CBD for dogs could also make your dog sick or tired.

So see your vet right away if your dog appears sluggish after taking a new medication or product.⁸ In some cases, these symptoms might be temporary – in other cases, your dog might just need a type of medication that fits them better.

Poisoning

Many medicines for people, such as common pain relievers, are actually toxic to dogs. So if your dog’s swallowed these by accident, they may appear lethargic or sick – if they’ve been poisoned.

Now to be poisoned doesn’t mean that they literally consumed poison – such as incesticide or rat poison (although that’s possible too). Many everyday household substances are toxic to dogs, from chocolate, alcohol and grapes to cleaners and chemicals like snail bait; plants and mushrooms to recreational or prescription drugs.

⚠️ If you suspect your dog has consumed anything that might be toxic, contact your vet or Animal Poison Control immediately. Here are a couple of emergency numbers:

Hypothyroidism

Another potential cause of lethargy in dogs is hypothyroidism, or an underactive thyroid. This condition is usually caused by underlying disease and causes the metabolism to slow down.

Other symptoms of hypothyroidism include:

• Weight gain
• Dull hair
• Excess shedding (or a thin coat in general)
• Sensitivity to cold temperatures
• Slow heart rate
• Difficulties moving
• Lack of coordination⁹

Other causes of lethargy in dogs

Besides these medical conditions, a lethargic dog may be experiencing:

• Neurological diseases, including epilepsy, inflammation, or even brain tumors.
• Pain. Arthritis in senior dogs tends to cause them pain while moving around. So they may grow reluctant to go on walks or play together with time.
• Trauma. Much like humans, sadly, dogs can also experience complex conditions like Post-Traumatic Stress Disorder (PTSD) and depression. Which may come across as a lack of interest in regular activities.
• Growing pains. Puppies under 4 months have livers that can’t increase their blood sugar yet (since they’re still small). So they might experience low blood sugar, which can cause them to feel tired and out of sorts.

How to watch out for lethargy in dogs

Even with all the information above, it can be hard to determine the exact cause of lethargy in your dog by yourself. But here are a few steps to get started:

• Inspect your dog for injuries
• Take note of all the symptoms your dog is experiencing.
• Are they just a little bit lazy (perhaps they’ve been indoors too much)?
• Or do they also show worrying signs of a health issue, such as vomiting or diarrhea?

Anytime you suspect sickness or pain in your dog, it’s a good idea to take them to the vet. The treatment for your lethargic dog will depend on what’s causing it in the first place.

Once you’re at your vet’s, they’ll run some tests to determine the cause of your dog’s lethargy. Plus, they’ll know best how to treat it – and advise you how to best manage it to get your buddy feeling their best again.

Where an Activity Tracker for dogs can help

Tracking your dog’s daily activity can be a lifesaver. But let’s admit it: it can get a bit tedious over time too.

💡 It’s where an Activity Tracker for dogs can do all the hard work and monitoring for you – and provide you actionable data to figure out when to head to your vet.

With its built-in motion detector, your trusty Tractive device logs in your dog’s every move – both over where they’re wandering, but also how often they’ve been active.

Which, with time, can help you figure out:

• How much is a “normal” level of activity for your dog.
• How active your dog is compared to other, similar dogs of their age and breed
• When there’s a dip in your dog’s regular activity – which might signal the beginnings of lethargy.

And with this data at hand, you’re more likely to have a productive conversation with your vet – and spot a health issue early.

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Ensure your buddy’s health & wellbeing – for a lifetime

Lethargy can be one of the sneakiest and easiest-to-miss signs your dog is sick. And its reasons can range from less serious concerns like your dog simply being tired from a day out walking or playing – or your senior dog slowing down with age.

But if you’re finding your dog both tired and generally less enthusiastic about playtime or even meals, keep an eye out for their behaviors. They might be suffering from:

• Canine parvovirus
• Distemper
• Kennel cough
• Leptospirosis
• Lyme disease
• Heartworms
• A medication that doesn’t agree with them
• Hypothyroidism
• Poisoning
• Chronic diseases
• Pain, trauma, or growing pains (like with puppies who are vulnerable to low blood sugar)

In these cases, it’s best to get your dog to a vet immediately to get them the treatment they need.

An Activity Tracker can help you spot the signs of lethargy early

With your trusty Tractive device logging in your dog’s active minutes all day, you can catch on to a drop in your dog’s activity much in advance. (Which could signal the beginnings of lethargy or sickness.) So you can head to your vet for a checkup much before your dog’s health takes a turn for the worse.

“Absolutely love this tracker…it gives great insights on (our dogs’) activity and sleep levels.

I’m comforted knowing that if they started acting strangely or the data shifted drastically that we could take them to vet potentially before we would notice something wrong.

Can’t recommend this tracker enough!“

– Eva, US (Source: Trustpilot)

Stay on top of your dog’s wellness

See how they’re doing at a glance with Wellness Score. Set goals. Compare with dogs like yours. Monitor sleep. Detect issues and keep them healthy.

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Want a super quick professional take on why your dog is lethargic? Check out this video below:

And if you’ve liked this post, share it with a friend or a loved one – and let’s help build a safer, kinder world for our furry friends together.

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Your furry friend’s health and wellbeing means as much as to us as it does to you. So we’ve made it a priority to only share medically-relevant content on our blog.

This post was checked, double-checked, and medically verified by Georgia-based vet, Dr. Dwight Alleyne.

Originally from Long Island, New York, Dr. Alleyne began his career at a no-kill animal shelter before becoming a licensed veterinary technician. He graduated from Cornell University Veterinary College in 2006 and completed an internship at Purdue University.

Now practicing in Georgia, Dr. Alleyne specializes in soft tissue surgery and ultrasounds. He also writes pet health articles on his website, “The Animal Doctor Blog” (www.anmldrblog.com).