I don't think that Nadi is much of a deterrent. She is only 6kg! It is time like these that I wish one dog I had been looking after around 7 years had been there as well. He was a 60kg Rhodesian Ridgeback with a head the size of Nadi. Strangely, this giant dog was a lot friendlier than Nadi is, but could turn into a demon if his masters were in any sort of danger.