End-stage kidney failure in dogs: when to euthanize

End-stage kidney failure in dogs is the point where the kidneys can no longer clear waste from the blood, even with treatment. Vets call it stage 4 chronic kidney disease. A dog at this point typically refuses food, vomits, loses weight and strength, and has breath that smells of ammonia. In the last days there may be mouth ulcers, shaking and seizures.

It is time to talk with your vet about euthanasia when your dog will not eat despite anti-nausea treatment, vomits most days, is too weak to get up, or no longer picks up after fluids. The diagnosis on its own is not the moment. Some dogs in stage 4 have comfortable weeks or months once the nausea and dehydration are treated.

What are the final stages of kidney failure in dogs?

When the kidneys fail, waste builds up in the blood and affects nearly every part of the body. These are the signs owners most often see as the disease reaches its end.

None of these confirms end-stage disease on its own. The same signs can come from a sudden kidney injury, an infection, pancreatitis or a flare-up that can be treated. The stage is set by blood and urine tests, which dog kidney disease stages and life expectancy explains.

A diagnosis is not the moment

"Kidney failure" covers very different situations. A dog whose kidneys fail suddenly, from a poison or an infection, may recover some function with fast hospital treatment. A dog with long-standing kidney disease can have a crisis after a bout of vomiting or dehydration and then return to a steadier state once it is treated.

Our overview of kidney disease in senior dogs covers the causes and the full range of treatment. Before you decide anything, ask your vet whether this is a crisis that might be brought back under control or the end of a long decline. In stage 4, the commonly reported outlook is weeks to a few months, with wide variation. How your dog responds to the first days of treatment tells the vet more than the numbers do. A dog who starts eating again is in a different place from one who does not.

Signs that treatment has stopped working

Treatment at this stage does not repair the kidneys. It is aimed at how the dog feels. The usual tools are fluids, given into a vein in hospital or under the skin at home, medicines for nausea and stomach acid, appetite stimulants, a kidney diet if the dog will eat it, and treatment for high blood pressure, high phosphorus or anemia. Your vet decides which of these your dog needs and at what dose.

These are the signs that they are no longer doing enough:

• Your dog still will not eat after several days of anti-nausea medicine and fluids
• Vomiting continues despite the medicine
• The lift after fluids is shorter each time, or does not come at all
• Blood values keep climbing between rechecks despite treatment
• Hospital stays are needed again within days or a couple of weeks of the last one
• Your dog cannot keep tablets down, or has to be held down for fluids and is frightened by them
• Weight keeps falling and your dog is too weak to walk outside

Dialysis is offered for dogs at a small number of specialist hospitals, mainly for sudden kidney injury, and it is very costly. A feeding tube is another option some owners are offered. Declining either is a reasonable choice.

Other illnesses limit what can be done

Old dogs seldom have only one problem, and the others narrow the options.

• Heart disease. Fluids help the kidneys, but too much fluid can overload a weak heart, and the diuretics used for heart failure are hard on the kidneys. A dog with both is difficult to keep in balance. See heart disease in senior dogs.
• Arthritis. The anti-inflammatory pain medicines commonly used for arthritis can be hard on the kidneys, so vets often have to reduce, change or stop them. A dog can end up sorer as well as sicker.

Never try to fill the gap with a human painkiller. Ibuprofen, naproxen, aspirin and acetaminophen can seriously harm or kill dogs, and failing kidneys make them more dangerous still.

Last days of a dog with kidney failure

Owners ask what the process of a dog dying of kidney disease is like because they are deciding whether to let it happen at home.

Without euthanasia, the usual course is that the dog stops eating completely, then stops drinking. Nausea continues, with drooling, retching and vomiting. The dog becomes too weak to stand and lies in one place, often cold to the touch. The mouth is ulcerated and sore. Urine output may fall away. Twitching and tremors can progress to seizures, and the dog finally slips into unconsciousness.

This usually takes several days, and the dog feels ill for most of that time. It is not the quiet passing in sleep that people hope for, which is why most vets advise euthanasia before a dog reaches this point. If you want your dog to die at home, ask about a vet who comes to the house. Signs a dog is dying of old age describes the final hours in more detail.

Dog kidney failure: when to euthanize

Kidney disease swings between better and worse days, which makes a single moment hard to pick. Counting days helps.

1. Define a good day for this dog. For example: ate at least one proper meal without coaxing, kept it down, got up to greet someone or go outside, and slept comfortably.
2. Mark every day on a calendar, good or bad, at the same time each evening. Do it honestly and let everyone in the house see it.
3. Look at the week, not the day. When bad days are as common as good ones and the trend is downward, it is time for the conversation. When the good days have stopped, call your vet that day.

A quality-of-life scale for senior dogs gives you a fuller score to track alongside the calendar. Then take these questions to your vet:

• Is anything treatable making this worse, such as an infection or dehydration?
• Is there any treatment we have not tried that could make my dog feel better, not only live longer?
• If we carry on, what is likely to happen next, and how soon?
• What would you do if this were your dog?

With kidney failure, choosing a day while your dog can still enjoy something is kinder than waiting for a crisis at night. Cost and your own capacity to give daily fluids and medicines are fair things to weigh.

Euthanasia is carried out only by a veterinarian, who normally gives a sedative first so your dog is asleep before the final injection. Never attempt it yourself. What happens during pet euthanasia explains the appointment, and why only a vet can put a dog to sleep covers same-day and low-cost options.

When to call the vet today

Call your vet or an emergency clinic now if a dog with kidney disease has any of these. Some have causes that can be treated, and all of them need a vet now.

• No food for 24 hours, or repeated vomiting
• Passing very little or no urine, or straining to urinate
• A seizure, tremors that do not stop, or sudden blindness
• Collapse, being unable to stand, or being hard to wake
• Black, tarry stools or blood in the vomit
• Labored or very fast breathing
• Any chance your dog ate grapes, raisins, antifreeze or a human medicine

This article is general educational information, not veterinary advice. The signs described can point to end-stage kidney failure but also to conditions that can be treated, and the time frames given are commonly reported ranges, not a prediction for your dog. Decisions about fluids, medicines, diet and the timing of euthanasia should be made with your veterinarian. Euthanasia must only ever be performed by a veterinarian.