Frequency of pyelitis, pyelonephritis, renal perivasculitis, and renal infarction in dogs.

The frequency of pyelitis, renal perivasculitis, and renal cortical inflammation was determined in 104 apparently normal dogs, 50 dogs with disease that were necropsied, and 20 dogs with experimentally induced cystitis. Abnormalities occurred least often (19%) in the apparently normal group and most often (55%) in the cystitis group. The frequency of specific lesions was generally higher in males than in females. Bacteria were isolated from kidney and urine of some of the apparently normal dogs, but their relationship to the lesions observed was not established.