Members' NAVLE study guide

Canine Acute Kidney Injury (AKI)

3,187 words 13 min read 4 figures Reviewed November 6, 2026

Acute kidney injury (AKI) is a sudden injury to the kidney, with or without a measurable fall in function, which shows up as retained uremic toxins or a change in urine output. In dogs it is usually acquired outside the hospital from toxins, infection or poor perfusion, but hospital-acquired cases are increasingly recognized. Unlike chronic kidney disease, AKI can recover if the cause is removed and the dog is kept alive long enough for the tubules to repair.

Key facts

Acute kidney injury (acute kidney failure) at a glance
  • Species and system: dog; urinary (kidney).
  • Causes: ischemia or inflammation (most common), nephrotoxins (ethylene glycol, grapes and raisins, aminoglycosides, NSAIDs), infection (leptospirosis, pyelonephritis), and prolonged obstruction.
  • Classic presentation: a previously well dog with acute lethargy, anorexia and vomiting, normal body condition, normal-sized or slightly large kidneys, azotemia and poorly concentrated urine.
  • Grading: IRIS AKI grades I to V by blood creatinine, subgraded by urine output and need for dialysis.
  • Zoonosis: leptospirosis, one of the main infectious causes, is zoonotic.

What's inside

13 sections in the full guide
  1. Key facts
  2. How the NAVLE tests this
  3. Cause and pathophysiology
  4. Clinical signs
  5. Diagnosis
  6. Three causes you must recognize
  7. Differential diagnoses
  8. Treatment and management
  9. Prevention, control and public health
  10. Prognosis
  11. Quick review
  12. Test yourself
  13. References
The full guide also has 4 tables, 4 figures, 3 self-test questions and 17 references, available to NAVLE members.

Read the full study guide

The full guide is part of every NAVLE plan, with diagnosis and treatment tables, figures, a quick review and self-test questions. Start a free trial to try the question bank, or log in if you are already a member.

Read the free overview article A shorter, free article on Acute kidney injury (acute kidney failure) on the NavleExam blog.

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Canine · Urinary