I have an 11 year old dog that I thought I could get away with not having neutered, no problem behaviors, I had no intention of ever breeding him. Well you guessed it ... he has a tumor in his one testicle and is going in to be neutered next week.
He's not a spring chicken but the vet thinks he'll do allright. Just wanted to warn people that this can occur, it's easier on the dog to have it done when they're young.
If the Angell vets would like to comment, thanks in advance.
12/06 Update: He's okay! I just hope someone will learn from my mistake. The undescended testicle was deep in his abdomen.