mine never makes a sound outside the house, inside the house she will bark if shes playing with the other dogs or (rarely) if im eating she thinks im teasing here.. but i tell her off and after that quiet as usual!
if you call dragging a border terrier around the room by its leg agressive then yes, but there only playing..
What i will say is, take your time on finding a pup, if you have to wait a few months for a decent litter then wait, i had to wait about 3 month for mine and in hindsight isnt a long time but it killed me