We used to joke and say he was gay 
I'm pretty sure my Dallas is

He's 9 in October and has never shown any interest - even with one bitch who was flaunting herself in his face

Maybe Zen doesn't want to be a daddy - he maybe sees himself as a carefree bachelor, the George Clooney of cocker spaniels

I imagine it would be frustrating though if he is part of your breeding plans.