To add to JT’s comments – If you haven’t already, consider enrolling your dog in puppy school. This will not only make sure that the dog will behave properly as it matures, but will support your assertion that he/she is not likely to become a problem and is a suitable companion for you.
In our large scheme in NSW our pet-by-law restricts the size of a pet to 12kgs – so that it can be carried if need be. However, we have also made an exception for a rescue greyhound – permission was restricted to a particular dog and lot and supported by a special-bylaw.
So, if you can ensure (prove) your puppy is well-trained, does not bark, is well-controlled on common property (muzzled, leashed), then you should be able to make a good case to keep your pet. It is unlikely that any NCAT action will go against you unless it is proven the puppy/dog is or is likely to be, a nuisance.