Hi, Welcome to JustAnswer. I'm a licensed veterinarian and I'll be happy to help. I am so sorry to hear of George's condition. We once thought that retained testicles would be more likely to become cancerous, but now this does not seem to be the case. Also, a retained testicle would likely still produce testosterone, but not be fertile. To my knowledge, there is no evidence that relates retained testicles to kidney failure, but I'll research this and be back shortly. In the meantime, has your vet diagnosed the cause of George's kidney failure? Dr. Barbara
As I thought, retained testicles are not a direct cause of kidney failure. However, a dog with active testosterone production may be more prone to mate and a bacterial infection called Brucellosis is most often passed venereally. Brucellosis could cause infectious kidney failure. Also, because George still had one testicle, it could have become cancerous (just like any organ) and set up an immune mediated disease of the kidney called amyloidosis.
no George is still eating but not as much and his toilet is still solid.
Often, we can't find a specific diagnosis of kidney failure, but there are infectious causes, immune causes, and cancerous causes. Also, if George is young, perhaps the congenital anomaly that led to cryptorchidism also affected his urinary tract. . .his kidneys. The tests I would check on George would be a Leptospirosis test, a Brucellosis test, an abdominal ultrasound to evaluate his kidneys, and urine culture and sensitivity test, and possibly a kidney biopsy.