What are the common diagnostic tests for acute kidney injury?

Common tests include a blood chemistry panel, electrolytes, urinalysis, and abdominal ultrasound. Urine culture or further imaging may also be recommended — follow your vet's advice on which tests are needed.

What can I prepare before the vet visit?

Record the time symptoms began, food and water intake, and the frequency of vomiting and urination. Collecting a fresh urine sample, filming episodes, or bringing past test results can all improve diagnostic efficiency.

What is the prognosis for acute kidney injury?

Prognosis varies depending on the underlying cause and how quickly the condition is identified. With timely supportive treatment and no severe concurrent organ damage, some cases can improve — regular follow-up as directed by your vet is recommended.

Is long-term follow-up required?

Most cases require several rounds of blood and urine monitoring to track kidney function recovery or deterioration. Follow your vet's guidance on the recommended follow-up schedule and frequency.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

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Disease Guide

Acute Kidney Injury in Dogs & Cats: Symptoms, Diagnosis & Care [2025]

Acute kidney injury is a sudden decline in kidney function that can be caused by toxins, infection, or dehydration, and requires urgent treatment to protect the kidneys.

Take 1 minute to check the symptoms first

Last updated: 2026/01/04

Pethealthmap Editorial Team

Sources: ACVIM, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek emergency care immediately

•Continuous heavy vomiting with inability to eat or drink
•Seizures with inability to stand, or extreme lethargy
•No urination for more than one day, or significantly reduced urine output

Schedule a clinic visit soon (within 24–72 hours)

•Noticeably reduced appetite lasting more than 24 hours
•Intermittent vomiting or repeated diarrhea episodes
•Abnormally increased or decreased water intake

01What symptoms indicate something is wrong?

Acute kidney injury often presents with changes in food and water intake, along with non-specific signs such as vomiting and lethargy, requiring timely assessment of kidney function and electrolyte status.

Noticeably reduced appetite or complete refusal to eat, with decreased food intake
Frequent vomiting or ongoing diarrhea, leading to fluid and electrolyte loss
Significantly increased or decreased water intake, with changes in urination frequency
Lethargy, reduced activity, or unwillingness to play
Reduced urine output, changes in urine color, or abnormal urine odor
Atypical signs such as fever, slow heart rate, or abnormal breathing

Seek emergency care immediately if you notice the following symptoms:

⚠️ If any of the above symptoms worsen rapidly, seek veterinary care immediately to prevent irreversible damage.

02How can you assess the situation at home? Key observations and when to go to the emergency clinic

Systematic home monitoring before your vet visit helps the veterinarian quickly understand the course of illness and identify possible causes.

Record your pet's actual daily food intake and how meal frequency changes over time
Note the frequency, timing, and appearance or color of any vomit
Monitor stool consistency, diarrhea frequency, color, and whether mucus is present
Measure and record body temperature (ear or rectal) if possible, and track any changes
Observe mental state: watch for drowsiness, weakness, or reduced activity levels
Track water intake and urination frequency; film urination episodes if needed

03How does the vet make a diagnosis? Common diagnostic tests

The vet combines physical examination with blood tests, urinalysis, and imaging to assess kidney function and identify possible causes.

Physical examination

assess mucous membrane color, skin turgor, and pulse quality

Blood tests

evaluate kidney markers, electrolytes, and systemic changes

Urinalysis

urine specific gravity, protein, blood, and testing for possible infection

Abdominal ultrasound

assess kidney size, structure, and urinary tract abnormalities

X-ray or CT scan if needed

evaluate organ position, urinary stones, or other structural abnormalities

Kidney biopsy may be discussed when necessary to clarify rare or unclear causes

04How is the condition treated and managed after diagnosis? Medications, dietary adjustments, and care guide

Treatment focuses on supportive care to stabilize hydration and electrolytes, with ongoing monitoring and treatment adjustments targeting the underlying cause.

Stabilize dehydration and electrolyte balance with supportive care such as intravenous fluids
Symptomatic treatments such as anti-emetics or infection control, based on veterinary judgment
Adjust dietary formulation based on the underlying cause and arrange short-term medication follow-up
Schedule regular blood and urine tests to monitor kidney function and recovery progress
Home care requires ongoing records of water intake, urination, and appetite changes
If the condition is complex or does not improve, referral to a veterinary nephrology specialist is recommended

05What should you prepare before the vet visit? Key information to help the vet identify the cause quickly

Note the time symptoms first appeared, the order in which they developed, and when they worsened

Prepare a written log of recent water intake and urination frequency

If possible, collect a fresh urine sample to bring to the clinic for rapid testing

Film any vomiting, abnormal urination, or reduced activity episodes for the vet to review

List all current medications, supplements, and a detailed feeding history

Bring past blood test, urine test, or imaging reports if available

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.