Thank you for such a quick response. There is another issue in that my dog has a cleft palate and I’m unsure about another major surgery. The vet suggested ultrasounding his tummy every year (or 6 months if I was really anxious) to catch anything that might start to grow. Nothing showed on an ultrasound today.

Prior to the neutering the vet was very much “this missing testicle needs to come out as the risks for cancer are very high” ….now it cant be found it’s “well we can ultrasound him regularly and catch things in it’s tracks, I’m not too concerned”. so I’m a bit confused.

Do you know how risky the retained testicle is for disease? I have my fingers crossed for a negative blood test.