In dogs, azotemia is usually a reflection of either acute renal injury or chronic renal disease. Circulatory disorders such as congestive heart failure may also result in azotemia due to reduced renal perfusion.
Three forms have been classified in dogs, relating to the cause of azotemia:
|Prerenal azotemia||decreased renal perfusion||hemmorhage, shock, congestive heart failure - BUN:Cr ration > 20|
|Renal azotemia||acute renal injury, glomerulonephritis||BUN:Cr < 15|
|Postrenal azotemia||urolithiasis, Leptospirosis, transitional cell carcinoma||BUN:Cr >15|