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I am sorry to hear Duke still has one undescended testicle. This is unfortunately a genetic problem. It is unlikely it will drop at this age. The biggest concern with an undescended testicle is the potential for tumor development. Over time, these often become cancerous and can be dangerous. It is easiest to remove them while they are younger as they are a little bit easier to find. There is not much benefit for you waiting to neuter at age 1 vs his current age. There would not be much risk either if you waited until age 1. I would not wait any longer than that.