I guess it depends on the dog breed and size, dog age, and location of the property. You need to find a place out in the hills (without close neighbours!), and perhaps contact the local council by email to check their rules. For instance Adelaide Hills Council say:
HOW MANY DOGS CAN BE KEPT:
Council by-laws generally limit the number of dogs that can be kept per household to two, however application in writing can be made to have this number increased. Special conditions apply.
This other forum also has some interesting comments: http://www.dolforums.com.au/lofivers...hp/t89595.html