"No, we have no puppies right now."
"Yes, we have puppies but they're already pre-sold."
"Yes, we have puppies but not what you want." (I want a Blenheim female.)
"Yes, we have puppies and they cost (fill in an exorbitant amount that's more than double what we're willing to pay.)"
"Try us again next winter."
"We can put you on our waiting list."