6 Early Warning Signs of Kidney Disease in Senior Dogs You Shouldn’t Ignore
Kidney disease is one of the most common health problems affecting older dogs. As your dog ages, their kidneys may start to show signs of wear and struggle to filter waste from the blood as well as they once did.
Catching these changes early can make a big difference in your senior dog’s comfort and longevity. Many symptoms are easy to miss at first because they develop slowly over time.
Your dog depends on you to notice when something seems off with their health. This article will help you understand what to watch for in your older dog and how vets check kidney function.
You’ll learn about the aging process and how it impacts your dog’s kidneys. Being informed means you can act quickly if your senior companion needs help.
1) Drinking More Water and Peeing All the Time
When your senior dog starts drinking more water than usual, it could be an early sign of kidney problems. You might notice their water bowl needs refilling more often throughout the day.
This extra thirst leads to more bathroom breaks. Your older dog may need to go outside more frequently or have accidents in the house even though they’ve been housetrained for years.
Healthy kidneys filter waste from the blood and control water balance in the body. When kidneys start to fail in aging dogs, they lose this ability.
The kidneys can’t concentrate urine properly anymore, so your dog’s body tries to flush out toxins by producing more diluted urine. This creates a cycle where your dog drinks more to replace lost fluids.
You might see them visiting their water dish repeatedly or even drinking from unusual places like puddles or the toilet. These changes can happen gradually, making them easy to miss at first.
Keep track of how often you refill the water bowl and how many potty breaks your senior dog needs. If you notice a clear increase in either, contact your vet for a checkup.
2) Losing Weight Even Though They’re Still Eating
Your senior dog might be eating their regular meals without any problems, but you notice they’re getting thinner. This can be a warning sign of kidney disease.
When kidneys aren’t working properly, your dog’s body can’t process nutrients the way it should. The food goes in, but your dog isn’t getting the full benefit from it.
This means they lose weight even though they’re eating normally. You might notice your older dog’s ribs becoming more visible or their waist looking more pronounced.
Their collar might fit more loosely than before. Kidney disease causes the body to burn through muscle mass and fat stores faster than usual.
If you see your senior dog losing weight while maintaining their usual appetite, it’s time to visit your vet. This symptom doesn’t always mean kidney disease, but it needs to be checked out.
3) Turning Away from the Food Bowl
When your senior dog starts turning away from their food bowl, it might signal that their kidneys aren’t working properly. Dogs with kidney disease often feel nauseated, which makes them less interested in eating.
You might notice your older dog sniffing their food but walking away without taking a bite. They may also become pickier about what they eat, only accepting certain treats or foods they previously ignored.
This happens because damaged kidneys can’t filter waste products from the blood as well as they should. These waste products build up and can make your dog feel sick to their stomach.
Your senior dog might also drink more water but eat less food. This combination is especially concerning and warrants a visit to your vet.
Keep track of how much your dog eats each day. If their appetite drops for more than a day or two, don’t wait to see if it gets better on its own.
4) Sleeping More and Moving Less
Your senior dog might naturally slow down with age, but sudden changes in energy deserve attention. When kidneys aren’t working well, toxins build up in the bloodstream and make your dog feel tired and weak.
You might notice your older dog sleeping more than usual or showing less interest in walks. They may not greet you at the door anymore or seem too tired to play with their favorite toy.
Dogs with kidney disease often experience fatigue because their bodies struggle to filter waste properly. This makes them feel unwell and less motivated to move around.
Watch for changes in your dog’s normal routine. If your typically active senior suddenly refuses walks or stays in bed all day, it’s worth checking with your vet.
Keep track of when the lethargy started and whether it’s getting worse over time.
5) Throwing Up or Acting Queasy
Your senior dog’s stomach becomes more sensitive with age. When their kidneys aren’t working properly, toxins build up in their body and can make them feel sick.
You might notice your dog throwing up more often than usual. Sometimes they won’t actually vomit but will act nauseated instead.
They may lick their lips a lot, drool more, or refuse to eat their meals. These symptoms happen because damaged kidneys can’t filter waste from the blood.
The toxins make your dog’s stomach upset and trigger nausea. Pay attention if your older dog starts having frequent vomiting episodes.
This is especially important if it happens along with other changes like drinking more water or having accidents in the house. Some dogs will also have bad breath that smells like chemicals or ammonia.
This smell comes from the toxins in their system. Don’t ignore ongoing stomach problems in your senior dog.
While occasional vomiting can be normal, persistent nausea or regular throwing up needs a vet visit.
6) Breath That Smells Like Chemicals or Ammonia
Your senior dog’s breath might smell different when their kidneys aren’t working properly. If you notice a sharp chemical smell or an ammonia-like odor coming from their mouth, this could be uremic breath.
When kidneys fail, toxins build up in your dog’s bloodstream. These waste products can’t leave the body the way they should.
The toxins then create a distinct smell that comes through in your dog’s breath. This type of bad breath is different from normal dog breath or the smell caused by dental problems.
It often has a sweet-chemical quality or smells like urine or ammonia. Uremic breath happens in the later stages of kidney disease in older dogs.
If you smell this unusual odor, your dog needs to see a vet right away. The buildup of toxins can make your senior dog feel very sick and affects their whole body.
Pay attention to how your dog’s breath smells during regular interactions.
What Happens to Your Dog’s Kidneys as They Age
As your dog gets older, their kidneys naturally lose some of their ability to filter waste and maintain proper fluid balance. These changes happen gradually and can make senior dogs more likely to develop serious kidney problems.
How Kidneys Change in Older Dogs
Your senior dog’s kidneys work harder as they age because the organs lose functional tissue over time. The tiny filters inside the kidneys, called nephrons, die off and can’t be replaced.
This means fewer working units are available to clean your dog’s blood. Older kidneys also become less efficient at concentrating urine.
Your dog may need to drink more water and urinate more often to remove the same amount of waste. The blood vessels that supply the kidneys can narrow with age, reducing blood flow and oxygen delivery to these important organs.
Senior dogs often experience a buildup of scar tissue in their kidneys. This makes the organs stiffer and less flexible.
The remaining healthy kidney tissue must work overtime to compensate for these losses, which can eventually lead to kidney disease if the damage continues.
Why Catching It Early Makes All the Difference
Catching kidney disease early can add months or even years to your dog’s life. Dogs typically don’t show obvious symptoms until they’ve lost 66-75% of their kidney function.
By the time you notice signs like increased thirst or weight loss, significant damage has already occurred. Early detection allows your vet to start treatment that can slow the disease’s progress.
Simple changes like a special diet, medication, or fluid therapy can help protect the remaining kidney function your dog still has. Regular blood and urine tests can spot kidney problems before your dog feels sick.
Senior dogs should have kidney function checked at least once or twice a year. These tests measure waste products in the blood and check how well the kidneys concentrate urine.
What Your Vet Will Do to Check Kidney Function
Your vet uses blood tests and urine samples to check how well your senior dog’s kidneys are working. These tests measure waste products in the blood and check if the kidneys are filtering properly.
What Happens at a Kidney Screening
Your vet will start by asking about your dog’s symptoms and recent behavior changes. They’ll want to know if your senior dog is drinking more water or having bathroom accidents.
The physical exam comes next. Your vet will feel your dog’s abdomen to check kidney size and look for any pain.
They’ll also check your dog’s hydration by gently pulling up the skin on the neck to see how quickly it returns to normal. Blood will be drawn from your dog’s leg or neck.
This is usually quick and causes minimal discomfort. Your vet will also need a urine sample, which they might collect with a sterile needle or catch in a cup during a bathroom break.
Most test results come back within a day or two. Some vets have in-house labs that provide results the same day.
The Main Tests Your Vet Will Run
The blood urea nitrogen (BUN) and creatinine tests are the main markers for kidney function. When these numbers go up, it means the kidneys aren’t removing waste properly from your dog’s blood.
SDMA (symmetric dimethylarginine) is a newer test that catches kidney problems earlier than traditional tests. It can detect issues when only 25% of kidney function is lost.
BUN and creatinine don’t show problems until 75% is lost.
A urinalysis checks your dog’s urine concentration. Dilute urine in senior dogs often signals kidney trouble.
The test also looks for protein, blood, or bacteria in the urine.
Your vet might recommend a urine protein-to-creatinine ratio (UPC) if they find protein in the urine. This test helps measure the severity of kidney damage.
