Pip had only one testicle too and I half jokingly asked the vet if the castrate would be half price and was told no it would be more because they have to dig around to find it! It did cost more too but all went well. He was over a year old when he was done and he is a dad as he had fathered a litter before I got him [which wasn't good idea with his prob] I have a picture of his litter and awwwwwww they look just like him