ours never lost drive
as old as yours is now the behaviors are set
he will not become a couch potato after the surgery
some people and some studies say they gain weight and i believe it does change their metabolism but the way to address that is keep him active and also adjust his food if necessary
i think pet overfeeding is a real thing in america anyway because the amt of dog food listed on the bag is way more than anything but a husky that runs all day and night might need!