Kidney & Urinary Health in Dogs and Cats: Signs Pet Owners Should Know
Your pet’s kidneys may not get much attention when everything is working normally, but they perform some of the body’s most important jobs.
The kidneys help filter waste from the blood, regulate fluid and electrolyte balance, and produce urine. The urinary system then carries and stores that urine until it leaves the body.
When something goes wrong with the kidneys or urinary tract, the earliest signs can be surprisingly easy to miss.
Knowing what’s normal for your pet—and recognizing changes early—can help you know when it’s time to call your veterinarian.
What Do Your Pet’s Kidneys Actually Do?
The kidneys are constantly working behind the scenes.
Among their many functions, they help:
- Remove waste products from the bloodstream
- Maintain the body’s fluid balance
- Regulate important minerals and electrolytes
- Help regulate blood pressure
- Produce hormones involved in red blood cell production
- Concentrate and produce urine
Because the kidneys perform so many essential functions, changes in kidney function can eventually affect much more than your pet’s urinary habits.
Signs of Kidney Problems in Dogs and Cats
Kidney disease can develop gradually, particularly in older pets, and early signs aren’t always dramatic.
One of the most recognizable changes is increased thirst and urination.
You may notice that your dog’s water bowl needs to be filled more frequently or that they’re asking to go outside more often. With cats, you might notice larger or more numerous clumps in the litter box.
Other possible signs include:
- Increased thirst
- Increased urination
- Decreased appetite
- Weight loss
- Vomiting or nausea
- Decreased energy
- Changes in coat quality
- Bad breath or unusual breath odor
- Dehydration
These symptoms aren’t specific to kidney disease and can occur with many other medical conditions. That’s why changes like these warrant a conversation with your veterinarian rather than trying to diagnose the problem at home.
Urinary Problems Can Look Different
Kidney disease isn’t the only condition that can affect your pet’s urinary health.
Dogs and cats can experience urinary tract infections, bladder inflammation, bladder stones, urinary crystals, and other conditions.
Signs of a urinary problem may include:
- Urinating more frequently
- Straining to urinate
- Passing only small amounts of urine
- Blood in the urine
- Urinating in unusual places
- Licking around the urinary opening
- Vocalizing while attempting to urinate
- Suddenly having accidents in the house
In cats especially, urinating outside the litter box shouldn’t automatically be assumed to be a behavioral problem. A change in litter-box habits can sometimes be a sign that something medical is happening.
A Special Warning for Cat Owners
If your cat is repeatedly attempting to urinate but producing little or no urine, seek veterinary care immediately.
A urinary obstruction can become a life-threatening emergency, particularly in male cats.
You may see repeated trips to the litter box, straining, crying or vocalizing, restlessness, licking the genital area, hiding, vomiting, or increasing distress.
If you’re unsure whether your cat is actually producing urine, it’s safer to contact a veterinarian or emergency veterinary hospital promptly.
Why Kidney Health Becomes More Important as Pets Age
Kidney disease can occur at different ages, but chronic kidney disease becomes more common as pets get older—particularly in cats.
One challenge is that the body can compensate for declining kidney function for some time. That means a pet may appear relatively normal even while changes are developing.
This is one reason routine veterinary examinations and laboratory testing become increasingly valuable as pets age.
Blood tests can provide information about kidney function, while urinalysis gives your veterinarian additional information about how well the kidneys are concentrating urine and whether other urinary abnormalities are present.
Your veterinarian may recommend additional testing depending on the results and your pet’s health history.
Hydration Matters
Water plays an important role in kidney and urinary health.
Make sure your pet always has access to fresh, clean water. Some pets—cats in particular—can be surprisingly selective about where and how they drink.
You can encourage water consumption by providing multiple water bowls, keeping bowls clean, experimenting with different bowl locations, or trying a pet water fountain if your pet prefers moving water.
Wet food contains more moisture than dry food and may be useful for some pets, but dietary changes should be based on your pet’s individual needs—especially if your pet has already been diagnosed with kidney or urinary disease.
Nutrition and Kidney Disease
Once a pet has been diagnosed with chronic kidney disease, nutrition may become an important part of the treatment plan.
Veterinary therapeutic diets formulated for kidney disease may modify levels of nutrients such as phosphorus, protein, sodium, and certain fatty acids.
But a “kidney-friendly” diet isn’t automatically appropriate for every pet.
Kidney disease has different stages, and pets can have other medical conditions or nutritional needs that influence dietary recommendations. Your veterinarian can determine whether a therapeutic diet is appropriate and which option makes sense for your pet.
What About Kidney Supplements?
Pet owners may also encounter supplements marketed to support kidney health.
Depending on the product, these may contain combinations of ingredients intended to provide nutritional support for pets with particular needs.
However, a supplement doesn’t replace veterinary testing, diagnosis, prescription treatment, or an appropriate diet.
If your pet has kidney disease—or you are considering adding a kidney-support supplement—talk with your veterinarian first. Your pharmacist can also help answer questions about how a recommended product should be administered and how it fits alongside your pet’s other medications.
This is particularly important because pets with chronic kidney disease may take multiple medications or supplements as their condition progresses.
Never Change Your Pet’s Medication Without Guidance
If your pet has been diagnosed with kidney disease, make sure every veterinarian and pharmacist involved in their care knows which medications and supplements your pet receives.
Kidney function can influence how the body handles certain medications, and some medications may require additional consideration in pets with kidney disease.
Don’t discontinue a prescribed medication, change the dose, or add an over-the-counter product without discussing it with your veterinarian.
Routine Care Can Help Catch Changes Earlier
One of the best things you can do is simply know your pet’s normal.
Pay attention to how much your pet typically drinks, how frequently they urinate, their appetite, body weight, activity level, and normal bathroom habits.
Then pay attention when something changes.
For older pets or those with existing medical conditions, your veterinarian may recommend more frequent examinations, bloodwork, or urine testing.
Those routine visits aren’t just about finding something wrong—they provide an opportunity to establish trends and identify changes that might otherwise be difficult to notice at home.
Protecting Your Pet’s Kidney & Urinary Health
There isn’t one simple trick that guarantees healthy kidneys for life. Instead, focus on the fundamentals:
Provide constant access to fresh water, feed an appropriate diet, maintain routine veterinary care, pay attention to bathroom habits, and don’t ignore changes in thirst, urination, appetite, or weight.
Most importantly, don’t wait for symptoms to become severe before asking questions.
Your pet can’t tell you that they’re drinking more, urinating differently, or simply don’t feel right. But their habits often can.
Have Questions About Your Pet’s Medications or Supplements?
The pharmacy team at Pet’s First Choice can help answer questions about medications, supplements, administration, storage, and products recommended as part of your pet’s care plan.
Ask Our Pharmacist
📞 803-834-3183
✉️ info@petsfirstchoicerx.com
Pet Health Academy content is provided for educational purposes and is not a substitute for veterinary diagnosis or treatment. Contact your veterinarian with concerns about changes in your pet’s health. Difficulty or inability to urinate can be an emergency and requires prompt veterinary attention.
