RESUMEN
The remnant kidney, a model of chronic renal failure in animals, can be obtained by two techniques: either surgical removal of tissue of one kidney, combined with contralateral nephrectomy or inducing necrosis of kidney tissue by ligation of branches of the renal artery of one kidney combined with contralateral nephrectomy. In the literature, most reports concern the ligation technique. The technique is safe and simple but the results in dogs are unpredictable. In this paper, both techniques were compared. We could demonstrate that the unpredictable result of the ligation technique is due to the formation of collateral vessels bypassing the ligated branches and to the inconstant ramification pattern of the renal artery. In this study, a standardized technique consisting of the resection of 16-18 g of tissue of one beagle kidney and removal of the other one is described. This method results in a stable chronic renal failure until the dogs are sacrificed at 9-12 months.