They sure do. Lost count of the number of times our dog has been bitten, daughter was bitten twice. The law is that dogs less than 20kg don't need to be on a lead (but they do need to be under control). In local speak this means their dogs can do what they want, while owners stand around talking. When the vicious shits attack and you ask the owner to put it on a lead, you get told 'No need, small dog la'.