Idiopathic hematuria of unilateral renal origin in a dog. 
Idiopathic hematuria of unilateral renal origin was diagnosed in a 3-month-old male Weimaraner.  The hematuria had been visible grossly for 6 weeks.  Extensive clinicopathologic, radiographic, and histologic evaluations localized the source of the hematuria to the right kidney, but could not identify a cause.  Nephrectomy of the right kidney resolved the problem.  This case report supports a previous article comparing canine idiopathic hematuria of renal origin with benign essential hematuria of human beings.