Signs of Kidney Failure in Dogs: Symptoms, Causes, and Differences Between Chronic and Acute Kidney Failure

Have you ever noticed something seems a little off with your dog and wondered if it could be a sign of kidney problems? Kidney disease in dogs can be worrying, especially when you are not sure what changes in your pet's health really mean. If you have noticed something unusual, it is natural to wonder whether your dog may need to see a vet.

You may come across terms like kidney failure, renal disease, acute kidney failure, and chronic kidney disease when learning about your dog's health. It can be a lot to take in, especially when you are simply trying to understand what may be happening to your pet. Knowing the basic terms can make it easier to talk with your vet and understand what they tell you.

If your dog is showing signs that have you concerned, it is worth taking a closer look rather than brushing them off. Read on to learn more about kidney failure in dogs and what pet owners should know.

What Is Kidney Failure in Dogs?

Kidney failure in dogs happens when the kidneys are no longer able to do their normal jobs properly. It can be worrying to hear that your dog has a problem with kidney function, especially when you are not sure what the diagnosis means. The extent of kidney damage can vary from one dog to another, so the condition does not look exactly the same in every case.

Understanding Kidney Failure in Dogs

Kidney or renal failure in dogs may also be referred to as kidney or renal disease when the kidneys are not working as they should. A loss of kidney function does not necessarily mean the kidneys have completely stopped working, as some dogs may still have a certain amount of remaining function.

• Kidney function can decrease by different amounts.
• Kidney damage may affect one or both kidneys.
• The severity of the disease can vary between dogs.
• Kidney failure can involve either a sudden or gradual loss of kidney function.
• The type of kidney failure can affect how the condition progresses.
• Kidney disease can develop at different stages.
• Some dogs may have reduced kidney function while still appearing relatively well.
• The condition can affect a dog's overall health and quality of life.
• Kidney failure can range from mild impairment to severe loss of kidney function.
• Many dogs can respond differently depending on the severity of their kidney disease.

What Is the Difference Between Acute and Chronic Kidney Failure?

Acute kidney failure and chronic kidney failure are mainly different in how quickly the loss of kidney function happens. Acute kidney failure, also called acute renal failure, can develop within hours or days, while chronic kidney failure, also called chronic renal failure, develops through a gradual loss of kidney function.

Acute Kidney Failure

• Kidney function suddenly decreases.
• It can develop within hours or days.
• Acute kidney failure in dogs may sometimes be reversible.
• The outcome can depend on the kidney damage and the underlying cause.

Chronic Kidney Failure

• Kidney function declines gradually.
• It develops as the disease progresses.
• It is generally linked to lasting changes in the kidneys.
• Permanent loss of kidney function usually cannot be restored.

A dog can also have chronic kidney failure and acute kidney failure at the same time. For example, a dog with chronic kidney disease may experience a sudden decline in kidney function, which is why understanding the type of kidney failure can be important.

What Are the Signs and Symptoms of Kidney Failure in Dogs?

The signs of kidney failure in dogs can vary quite a bit, and some symptoms may be easy to miss at first. You might simply notice that your dog is drinking differently, eating less, or not acting quite like themselves. Dogs with kidney disease can show different changes depending on their condition, so it is worth paying attention when something feels unusual.

Changes in Drinking and Urination

Changes in thirst and urination can be among the early signs of kidney disease. If your dog's usual bathroom habits suddenly seem different, it is something worth keeping an eye on.

• Drinking more water than usual
• Drinking less water than usual
• Urinating more often
• Producing more urine
• Urinating less often
• Having accidents indoors
• Straining or having trouble urinating

Changes in Appetite and Weight

You may notice that your dog is not as interested in food as they normally are. Dogs suffering from kidney failure can also lose weight as the disease progresses.

• Eating less
• Refusing food
• Losing weight
• Losing muscle
• Showing less interest in treats or favourite foods

Digestive Symptoms

Some dogs with kidney disease and renal failure can develop stomach or digestive problems. These symptoms can also make it harder for a dog to maintain their normal eating habits.

• Nausea
• Vomiting
• Diarrhea
• Constipation
• Excessive drooling
• Loss of appetite

Changes in Energy and Behaviour

Sometimes, the first thing you notice is simply that your dog does not seem like themselves. They may spend more time resting or lose interest in things they normally enjoy.

• Sleeping more than usual
• Tiredness
• Weakness
• Reduced activity
• Less interest in playing
• Reluctance to move
• Appearing withdrawn
• Being less responsive

Changes in Physical Condition

As kidney disease progresses, changes in your dog's physical condition may become easier to notice. These can vary depending on the stage of the disease and the dog's overall health.

• Dehydration
• Pale gums
• A dull or poor-quality coat
• Swelling in the legs or other areas
• A thinner or weaker appearance
• Dry skin or coat

Mouth and Breath Changes

You may also notice something different when your dog yawns, pants, or comes in for a cuddle. Dogs diagnosed with kidney failure can sometimes develop changes affecting their mouth and breath.

• Bad breath
• An unusual or chemical-like smell from the breath
• Mouth ulcers
• Sores in the mouth
• Increased drooling

Keep in mind that dental disease can also cause bad breath, so this sign by itself does not mean your dog has kidney disease.

Neurological and Coordination Changes

In more serious cases, kidney disease can affect how a dog moves or behaves. Sudden changes like these are especially important to take seriously.

• Tremors
• Muscle twitching
• Difficulty walking
• Poor coordination
• Loss of balance
• Confusion
• Unusual behaviour
• Changes in vision

Severe or Advanced Signs

When kidney failure becomes severe, a dog may become noticeably unwell. This can be especially concerning when a dog is suffering from acute kidney failure, or there is a rapid decline in kidney function.

• Repeated vomiting
• Severe weakness
• Difficulty standing
• Extreme lethargy
• Seizures
• Collapse
• Loss of consciousness

Not every dog diagnosed with kidney failure will have all of these symptoms, and dogs can respond differently to kidney disease. If your dog shows signs of acute kidney failure or suddenly becomes much more unwell, seeking veterinary care is important.

What Causes Renal Failure and Kidney Disease in Dogs

There are quite a few reasons a dog can develop kidney disease, and the cause can be different from one dog to another. Some cases of acute kidney failure happen suddenly, while chronic kidney disease develops more slowly over time. It can also be frustrating when a dog is diagnosed with kidney disease, but the exact cause is not immediately clear.

What Causes Acute Kidney Failure?

Acute kidney failure, or acute renal failure, happens when the kidneys are affected suddenly. Cases of acute kidney failure can become a serious health risk for dogs, especially when the problem is not addressed quickly. Acute kidney failure in dogs includes:

• Ingesting a toxin or poisonous substance
• Certain medications or chemicals
• Severe dehydration
• Significant blood loss
• Low blood pressure
• Reduced blood flow to the kidneys
• Serious infections
• Urinary blockage
• Kidney or urinary tract injury
• Severe heat-related illness

What Causes Chronic Kidney Disease?

Chronic kidney disease usually involves a gradual loss of kidney function. It can be difficult to know exactly why it happens in some dogs, particularly when there is no single obvious cause.

• Age-related changes in the kidneys
• Inherited kidney conditions
• Kidney abnormalities present from birth
• Repeated kidney infections
• Long-term inflammation
• Immune system disorders
• Previous kidney injury
• Long-term exposure to substances that can damage the kidneys
• Other ongoing health conditions

What Health Problems Can Affect the Kidneys?

Sometimes, kidney disease is found alongside another health problem. When a dog is diagnosed with kidney disease, the vet may look at their overall health to help understand what could be contributing to it.

• Severe dental disease or infection
• Diabetes
• Heart disease
• Liver disease
• High blood pressure
• Certain cancers
• Urinary tract disorders
• Conditions that cause repeated dehydration

What Toxins Can Cause Kidney Damage?

Toxin exposure is something dog owners should take seriously because some substances can cause major kidney damage. A dog can come across these substances at home or outdoors, sometimes without the owner realizing it.

• Antifreeze
• Some human medications
• Certain pesticides and chemicals
• Toxic plants
• Contaminated food or substances
• Other poisonous household products

Can Acute Kidney Failure Be Reversed?

In some cases, acute kidney failure can be reversed when the underlying cause is found and addressed early. Unfortunately, this is not possible in every case, especially when the kidneys have suffered severe or permanent damage.

• The underlying cause
• The amount of kidney damage
• How quickly treatment can begin
• Whether the cause can be treated
• How the dog responds to care
• Whether permanent kidney damage has occurred

Why Does the Underlying Cause Matter?

Knowing what caused the problem can give the vet a better idea of what the dog is dealing with and how the condition may progress. It can also help guide decisions about the care the dog needs.

• Acute kidney failure may have a sudden trigger.
• Chronic kidney disease may involve lasting kidney damage.
• Some causes can be treated, while others may lead to permanent damage.
• The exact cause may not always be identified.
• Dogs can be affected by different combinations of health conditions and risk factors.

How Are Chronic Kidney Disease and Kidney Failure Diagnosed By Vets?

If your dog shows signs of kidney failure, it can be stressful not knowing what is causing the changes. Vets usually look at several pieces of information and test results rather than relying on one test alone. This helps them understand what is going on, whether the problem is acute or chronic, and how far the disease has progressed.

Medical History and Physical Examination

The vet will usually start by asking what you have noticed at home and about your dog's health history. These details can be surprisingly helpful when vets explain the signs of acute or chronic kidney failure in dogs, especially when symptoms early on may be subtle or easy to overlook.

• Changes in drinking or urination
• Changes in appetite or weight
• Symptoms of chronic kidney disease
• Previous illnesses or health problems
• Current medications or supplements
• Possible exposure to harmful substances
• Signs of dehydration
• Changes in overall body condition

Blood Tests

Blood tests can give vets a better idea of how well the kidneys are working. They can also show changes that may be important when assessing dogs diagnosed with kidney failure.

• Creatinine levels
• Blood urea nitrogen (BUN)
• Electrolyte levels
• Phosphorus levels
• Red blood cell levels
• Other blood values related to overall health

Urine Tests

A urine sample gives vets another useful look at kidney function. It can also provide clues about the disease and the underlying cause, especially when the urine results are considered alongside the blood tests.

• How concentrated the urine is
• Protein in the urine
• Blood in the urine
• Signs of infection
• Cells or crystals
• Other unusual findings

Imaging and Additional Tests

Sometimes, the first round of tests does not tell the whole story. Depending on the dog's condition, vets may recommend additional testing to help explain why kidney failure occurs or to look for changes affecting the kidneys and urinary system.

• X-rays
• Ultrasound
• Blood pressure measurement
• Urine culture
• Additional blood tests
• Additional urine tests
• Other tests based on the dog's condition

Determining the Stage of Kidney Disease

Once the results are reviewed, vets can assess the stage of kidney disease and how much the condition has affected the dog. This can help show the progression of the disease and whether the findings fit better with a long-term problem or cases of acute kidney failure.

• Blood test results
• Urine test results
• Blood pressure
• Kidney function
• Physical findings
• Symptoms and medical history
• The dog's overall health
• Whether the condition appears acute or chronic

What Happens After a Dog Is Diagnosed?

Being told that your dog is diagnosed with kidney disease or kidney failure can feel overwhelming, especially when there are a lot of test results to take in. Vets can explain what the findings mean, discuss the severity of the condition, and help you understand what comes next.

What Treatment Options and Prognosis Are Available for Dogs With Kidney Failure?

Treatment depends on the type of kidney problem, its underlying cause, and how much kidney function remains. For pets suffering from acute kidney failure, the focus may be on dealing with the immediate problem, while dogs with chronic disease often need ongoing care.

Treatment for Acute Kidney Failure

Acute kidney failure can develop quickly, so dogs with acute kidney failure may need veterinary care as soon as possible. When the causes of acute kidney failure can be identified and treated, kidney function may improve in some cases.

• Fluid therapy to help with dehydration
• Treatment for the underlying cause
• Medication for nausea or vomiting
• Nutritional support when needed
• Monitoring kidney function
• Hospital care for dogs that are seriously ill

Managing Chronic Kidney Disease

There is generally no cure for chronic kidney disease when permanent kidney damage has occurred. Instead, care focuses on managing the condition, supporting the kidney function that remains, and helping the dog stay comfortable.

• A kidney-friendly diet when recommended
• Managing high blood pressure
• Medication for nausea or vomiting
• Support for poor appetite
• Managing mineral or electrolyte problems
• Regular veterinary checkups
• Adjusting care as the disease progresses

When Is Dialysis Considered?

Dialysis may be considered when the kidneys are no longer able to do enough of their normal work and standard treatment is not enough. In certain situations, the veterinary team may discuss dialysis or a kidney transplant as an advanced option.

• Hemodialysis
• Peritoneal dialysis
• Continuous renal replacement therapy
• Kidney transplantation in selected cases

These options are not suitable for every dog, and access to them can vary. The veterinary team can explain whether an advanced treatment makes sense based on the dog's condition.

What Is the Prognosis for Dogs With Kidney Failure?

The prognosis for dogs can be very different from one case to another. It depends on whether the problem is acute or chronic, the underlying cause, how much kidney damage has occurred, the stage of the disease, and how the dog responds to treatment.

• Some cases of acute kidney failure can be reversed.
• Chronic kidney disease generally cannot be cured once permanent damage has occurred.
• Dogs with less severe disease may have more options for long-term management.
• Severe kidney failure can have a more guarded prognosis.
• Regular veterinary care can help track changes as the disease progresses.

Can Dogs With Kidney Failure Maintain a Good Quality of Life?

Kidney failure is a very serious condition, but it does not automatically mean that a dog cannot have a comfortable and meaningful time with their family. Many dogs can still enjoy their normal routines when symptoms are managed, and their care is adjusted as their needs change.

• Maintaining an interest in food
• Staying reasonably comfortable
• Enjoying familiar activities
• Having manageable symptoms
• Responding well to treatment
• Continuing regular veterinary care

Final Thoughts

Kidney failure in dogs can be scary, especially when you first notice that something is not quite right with your pet. Acute and chronic kidney problems can develop differently, so knowing the possible signs and causes can help you know when it is time to take action.

Even small changes in drinking, urination, appetite, or behaviour are worth paying attention to. A vet can run the right tests to understand what is happening and how serious the problem may be.

With proper treatment and ongoing care, some dogs can stay comfortable and continue enjoying their everyday routines. If something about your dog's health has you worried, getting veterinary advice can give you a clearer idea of what to do next.

Frequently Asked Questions

Can veterinary care prevent kidney disease from getting worse?

Veterinary care cannot always stop kidney disease from progressing, but regular checkups can help keep track of what is happening. For dogs diagnosed with kidney disease, staying in touch with the vet can make it easier to notice changes and adjust their care when needed.

Regular checkups: Routine veterinary visits can help your vet keep track of your dog's condition.

Following the care plan: Giving medications as prescribed and following dietary advice can help with ongoing management.

Watching for changes: If you notice new or worsening signs of kidney disease, let your vet know.

Acting early: Bringing up changes sooner gives the veterinary team a chance to reassess your dog.

Every dog is different: Kidney disease does not progress at the same pace in every dog.

How should owners monitor dogs with kidney disease at home?

When you live with dogs with kidney disease, you naturally start noticing little changes in their usual routines. Keeping an eye on these everyday habits can help you spot something that does not seem right.

Daily habits: Pay attention to your dog's eating, drinking, urination, activity, and behaviour.

Appetite: Notice if your dog starts eating less or suddenly loses interest in food.

Energy levels: Watch for unusual tiredness, weakness, or less interest in things they normally enjoy.

Keep notes: Jotting down changes can give your vet a clearer picture during appointments.

Speak up: If something seems different or your dog gets noticeably worse, contact your veterinary team.

Can dogs diagnosed with kidney disease still enjoy normal activities?

Yes, some dogs diagnosed with kidney disease can still enjoy many of the things they are used to doing. It really depends on how they are feeling, so the best approach is to let your dog set the pace.

Keep things gentle: Short walks or other easy activities may still be enjoyable.

Let them rest: If your dog seems tired, give them a chance to take a break instead of pushing them.

Keep familiar routines: Regular mealtimes and familiar surroundings can help your dog feel more comfortable.

Watch how they respond: If an activity seems to leave your dog uncomfortable or exhausted, it may be time to slow things down.

Enjoy the simple moments: Quiet time together, gentle attention, and relaxing at home can still mean a lot.

How often should dogs with kidney disease receive veterinary checkups?

There is no set schedule that works for every dog with kidney disease. Some dogs may need more frequent visits, while others may only need checkups at longer intervals depending on how stable their condition is.

It depends on their condition: Dogs with more serious or changing problems may need closer monitoring.

Test results matter: Your vet may suggest follow-up blood or urine tests based on earlier results.

Watch for changes: New or worsening signs may mean your dog should be checked sooner.

Treatment can change: Changes to medication, diet, or other care may require additional follow-up.

Follow your vet's advice: Your veterinary team can recommend a schedule based on your dog's individual needs.

Can the signs of kidney failure change as a dog's condition progresses?

Yes, the signs of kidney failure can change over time, and not every dog will experience the same symptoms. You may notice small changes at first, followed by more noticeable symptoms as the condition progresses.

Symptoms can vary: Dogs can show different signs depending on their individual situation.

New signs may appear: Your dog may develop symptoms that were not there earlier.

Existing signs can worsen: A mild change may become more noticeable over time.

Keep paying attention: Knowing your dog's normal habits makes it easier to spot something unusual.

Tell your vet: Let your veterinary team know about any new or worsening signs so they can decide whether your dog needs another assessment.