Diagnosis and Treatment of Kidney Diseases in Horses Acute kidney injury is the current term for compromised renal function that often is reversible if treated appropriately. Clinical signs of horses with acute kidney injury can be as nonspecific as anorexia and lethargy. Read More Related: • Causes of Red Urine in Horses Reviewed Ask The Vet Coggins Test for Equine Infectious Anemia (Swamp Fever) Q. My horse was turned away from a horse show because we didn't have proof of a current negative Coggins test. Is it really that important? A.