can be acquired by the ingestion of saliva of a dog infected with rabies and showing obvious signs of rabies.. There are very less chances if the dog is infected and does not show signs of rabies, i.e the dog is usually not infectious during that period...
The signs of rabid dog are frequent barking, aggressive behaviour, excessive salivation
, aversiveness towards water, etc. As per your observations the dog is not rabid and the chances of acquiring rabies is very minimal but the dog being not vaccinated it cannot be eliminated completely