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  From what I have read here and elsewhere, the likelihood that an undescended testis will drop decreases with age.  
 The procedure for taking care of this is more invasive than a standard neutering, as your vet has explained, often compared to the level of risk of spaying a female.
 
 Follow your vet's advice.  Ask him if he has performed this procedure before.  As long as to trust his/her skill, I would go ahead if this were my pup.
 
 Best wishes and keep us posted.
 
				__________________ Kristin, Max and Teddy   |