How about putting a big "Beware of Dog" sign where they'd see it easily. Afterall, dogs love meat! Might make them think twice.
hg - just tell them you have "all the prime chuck you could ever want".....and then smile and close the door.... "thank you , no...I like me meat on the hoof not on wheels" ..tell them you have no room since your hubby brought home all that road kill from West Virginia... ...tell them tyou are not allowed to eat red meat becuase it interacts with all the special meds for MPD. when they ask what the is ...just go into another personality and call the salesman mommy dearest......