Dog Not Urinating for 24 Hours: When It's an Emergency

Name: Dog Not Urinating for 24 Hours: When It's an Emergency
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

A dog not urinating for 24 hours is a medical emergency that can become fatal within hours. A complete blockage of the urethra, the tube that carries urine out of the body, is the most common reason, and it needs immediate veterinary care [1]. Healthy adult dogs usually pee three to five times a day, so a full day with no urine is never normal.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

A dog that has produced no urine for 24 hours needs to be seen by a veterinarian right now, not tomorrow.
Complete urethral blockage is a medical emergency, and treatment depends on the cause and how long the blockage has lasted [1].
The bladder can stretch and weaken when it stays full, and some dogs then need a catheter left in place or placed every few hours for 3 to 7 days to regain muscle tone [1].
If a dog is truly not producing urine because of kidney injury, treatment may include intravenous fluids, a bladder catheter, and sometimes medication, and about 50% of dogs with severe acute kidney injury survive [1].
Do not wait to see if your dog pees on its own. Call an emergency clinic and go.

What "Not Urinating" Actually Looks Like

Owners often use this phrase for two different problems. The first is a dog that tries to pee and nothing comes out, or only drops come out. The second is a dog that seems fine but has not lifted a leg or squatted in a full day. Both matter, but the first is usually more urgent.

Normal urine habits in adult dogs

Most healthy adult dogs urinate three to five times daily. Small breeds and puppies pee more often, sometimes every couple of hours. A dog that normally pees four times a day and suddenly produces nothing for 24 hours has a real problem.

Puppy not urinating for 12 hours

A puppy not urinating for 12 hours is also concerning. Puppies have smaller bladders and drink more often relative to their size. Twelve hours with no urine in a young puppy is a reason to call your veterinarian the same day, especially if the puppy is crying, pacing, or licking at the belly.

Signs that go with it

Watch for these clues:

Squatting or lifting a leg many times with little or no urine
Crying or whining while trying to pee
A hard, swollen belly
Vomiting, drooling, or refusing food
Weakness, wobbling, or collapse
Blood in the urine or a strong odor

If your dog is straining without producing urine, read Dog Unable to Urinate: A Life-Threatening Emergency for more on what to do first.

Main Causes of a Dog Not Urinating for 24 Hours

The table below lists the most common reasons a dog stops peeing, along with typical clues and how quickly you need to act.

Cause	Typical clues	How urgent
Urethral blockage (stones, crystals, tumor, clot)	Straining, crying, hard belly, drops of blood, male dogs most often	Emergency now [1]
Acute kidney injury	Sudden vomiting, not eating, drinking a lot or not at all, weakness	Emergency now [1]
Dehydration or shock	Dry gums, sunken eyes, weakness, recent vomiting or diarrhea	Emergency now [1]
Bladder stones or severe cystitis	Frequent small pees, blood, pain, accidents in the house	Same day [2]
Urethral sphincter mechanism incompetence (USMI)	Leaking urine while resting, more common in spayed females	Routine visit [3]
Ectopic ureters	Constant dribbling since puppyhood, wet bedding	Routine visit [3]
Detrusor instability	Urinating small amounts often, urgency	Routine visit [3]
Medications or toxins	Recent NSAID use, antifreeze exposure, new drug	Emergency now [4]

Blockage of the urethra

Complete physical blockage of the urethra is a medical emergency [1]. Stones, crystals, tumors, or blood clots can plug the tube. Male dogs have a longer, narrower urethra, so they block more easily. A dog with a full bladder that cannot empty will become very sick within a day.

Kidney injury

Acute kidney injury means the kidneys suddenly stop filtering waste. A dog may urinate more than usual early on, then produce little or no urine as the injury worsens [1]. One report described a dog that developed severe kidney injury after receiving firocoxib, an NSAID, and needed dialysis when urine output stayed low despite fluids and diuretics [4]. If the cause can be found, treatment targets that cause [1].

Red Flags That Make This an Emergency

Go to an emergency clinic right away if you see any of these:

No urine for 24 hours, or 12 hours in a puppy
A hard, painful, swollen belly
Repeated attempts to pee with nothing coming out
Crying or yelping while squatting
Vomiting, drooling, or collapse
Blood in the urine or a sudden stop in urine after a long strain
Known or suspected antifreeze exposure
Recent NSAID use with sudden illness

A blocked dog can go downhill fast. The bladder can overfill and stretch, and the muscles that push urine out can weaken [1]. Waste products build up in the blood, which can cause vomiting, heart rhythm problems, and death.

If your dog is straining but still passing some urine, read Dog Straining to Pee: Emergency or Urgent? to help decide how fast you need to move.

What You Can Safely Do at Home While Waiting

You cannot unblock a dog at home. Do not try to press on the belly, give human medications, or wait it out. Here is what you can do:

Call the nearest emergency clinic and tell them your dog has not peed for 24 hours. They may tell you to come in immediately.
Keep your dog calm and quiet. Carry small dogs instead of making them walk.
Do not give any medication, including over-the-counter pain pills. Some human drugs are toxic to dogs.
Offer small sips of water if your dog is alert and not vomiting. Do not force water.
Note the time of the last known pee, any straining, and any vomiting. Bring this information with you.
If your dog collapses, has trouble breathing, or has a seizure, go now.

If your dog is also not eating, see Dog Not Eating for 24 Hours: When to Start Worrying. Two days of no urine and no food together is a serious combination.

What Your Veterinarian Will Check and Test

Your veterinarian will start with a full physical exam, including feeling the bladder through the belly wall. A very large, firm bladder in a dog that cannot pee points to a blockage.

Tests your vet may run

Blood work to check kidney values, electrolytes, and hydration
Urinalysis to look for crystals, blood, infection, and concentration
X-rays or ultrasound to find stones, tumors, or a blocked urethra [2]
Blood pressure and sometimes a urine culture

Treatment options

Treatment depends on the cause. For a blocked urethra, a catheter may be used to push the blockage back into the bladder, or surgery may be needed to remove it [1]. Dogs whose bladder muscles have been weakened by overfill may need a special catheter that stays in place or is placed every few hours for 3 to 7 days so the bladder can empty and regain tone [1].

For kidney injury, treatment may include intravenous fluids, a bladder catheter, and sometimes medication to promote urination [1]. If those do not work and the dog is not producing urine, the remaining options are kidney dialysis or euthanasia [1]. About half of dogs with severe acute kidney injury survive [1].

Some causes need specific drugs. For example, prazosin and tamsulosin are used in cats to relax ureteral smooth muscle, and obstructions that do not respond within 24 to 72 hours may need surgery or a stent [5]. In dogs, USMI is treated with phenylpropanolamine or, in females, estrogen compounds such as estriol or diethylstilbestrol [3]. Detrusor instability is treated with oxybutynin chloride [3]. Your veterinarian calculates the exact dose from your dog's weight and health.

In some cases, a urethral stent can restore urine flow quickly. One report described a 14-year-old dog with a multifactorial blockage from a suspected tumor and widespread stones who had a stent placed and showed improved kidney values within 3 days [2].

Dialysis is another option for severe cases. A study of dogs with acute kidney injury treated with intermittent hemodialysis found only mild, short-lived changes in blood cell counts after sessions [6]. Another study found that some dogs who survive acute kidney injury still have kidney dysfunction months later, so follow-up testing matters [7]. Dogs with acute-on-chronic kidney disease, meaning long-standing kidney disease that suddenly worsens, had a 53% survival to discharge after renal replacement therapy, compared with 70% for dogs with acute kidney injury alone [8].

Prevention and Monitoring

You cannot prevent every cause, but you can lower the risk:

Make sure your dog drinks enough water, especially in hot weather.
Feed a diet your veterinarian recommends if your dog has had stones or crystals.
Keep up with routine wellness visits so kidney changes are caught early.
Ask your vet before giving any NSAID or new medication, since some drugs can trigger kidney injury [4].
Watch for changes in how often your dog pees. More peeing can be an early sign of kidney disease [1].
If your dog has had a blockage before, follow your vet's monitoring plan closely.

If your dog has had urinary problems before and starts straining again, read Dog Straining to Urinate: Causes and When It's an Emergency for a fuller list of causes.

Limitations and When to Contact a Veterinarian

This article cannot tell you what is wrong with your dog. Only a veterinarian who examines your dog can do that. Use these timing guides:

Emergency now: no urine for 24 hours, no urine for 12 hours in a puppy, a hard swollen belly, repeated straining with no urine, collapse, vomiting with no urine, or suspected antifreeze or drug exposure.
Same day: straining with only small amounts of urine, blood in the urine, or a sudden change in pee habits with pain.
Routine visit: leaking urine while resting, constant dribbling since puppyhood, or frequent small pees without pain.

If you are unsure, call your veterinarian or an emergency clinic. It is always safer to be seen and sent home than to wait.

Frequently Asked Questions

How long can a dog safely go without peeing?

A healthy adult dog can usually hold urine for 8 to 12 hours overnight, but going a full 24 hours with no urine is not safe. A complete urethral blockage is a medical emergency [1]. Puppies and small breeds have less capacity and should not go nearly that long.

Can I wait until morning if my dog has not peed all day?

No. If your dog has produced no urine for a full day, go to an emergency clinic now. Waiting can lead to bladder damage, kidney injury, and death. The bladder can stretch and weaken, and waste products build up in the blood [1].

What if my dog is trying to pee but only drops come out?

That pattern often means a partial or complete blockage, and it is an emergency. A catheter or surgery may be needed to clear the urethra [1]. Do not wait to see if it improves on its own.

Will my dog need dialysis?

Only some dogs do. Dialysis is considered when other treatments fail and the dog is not producing urine [1]. It is not available everywhere, and your veterinarian will discuss whether it is an option for your dog.

Can a urinary blockage come back after treatment?

Yes. Dogs with a history of stones, crystals, or tumors can block again. Your veterinarian may recommend a special diet, monitoring, or surgery to lower the risk. Follow-up testing is important because some dogs have lasting kidney changes after an injury [7].

References

Noninfectious Diseases of the Urinary System in Dogs - Dog Owners. Merck Veterinary Manual.
Case Report of Urethral Stenting in a Dog with Multifactorial Lower Urinary Tract Obstruction Associated with Suspected Transitional Cell Carcinoma and Severe Cystolithiasis. Veterinary sciences, 2026.
Disorders of Micturition in Dogs and Cats - Urinary System. Merck Veterinary Manual.
Resolution of Noncardiogenic Pulmonary Oedema and Suspected Uraemic Pneumonitis in a Dog With Acute Kidney Injury Treated by Haemodialysis. Veterinary medicine and science, 2026.
Obstructive Uropathy in Dogs and Cats - Urinary System. Merck Veterinary Manual.
Hematological changes after intermittent hemodialysis in dogs with acute kidney injury are mild and transient. American journal of veterinary research, 2026.
Preliminary study investigating the role of estimated glomerular filtration rate, proteinuria and hypertension to inform on chronic kidney disease after acute kidney injury. The Journal of small animal practice, 2026.
Dogs and cats with acute-on-chronic kidney disease have worse outcomes than those with acute kidney injury following renal replacement therapy. Frontiers in veterinary science, 2026.