Baddog!

Her ears perk at something, creak of a gate, shoes hurrying up steps, clunk of the mail-slot... and she's already there barking and snarling at the foreign body, a 2-D rat-cat-rabbit, one whose ears she has already ripped off by the time I arrive. 

Enough! When I picked up the wean I drove off to a hardware shop and bought a mail-cage (or whatever you call it).