Renal allografts were performed between unrelated donors and 15 dogs with n
aturally occurring end-stage renal disease. Donor selection was based on co
mpatible dog erythrocyte antigen typing and cross-matching. An immunosuppre
ssive protocol consisting of rabbit antidog antithymocyte serum, cyclospori
n-A, azathioprine, and prednisone was used to control postoperative rejecti
on of the donated kidney. Although seven animals died because of technical
failures or rejection episodes, a median survival time of eight months has
been achieved, with two dogs living for longer than five years after surger
y. Long-term survivors have died from a variety of problems not related to
renal allograft rejection.