Away from their home territory and off the lead not under direct control by their owner any dog can be dangerous .. a big problem is that chavs think that a tough looking dog off the lead is a status sybol and daft cunts think that their dog is a child when it is actually something with an entirely differences set of senses than a human .. an issue is that a lot of people fail to understand what "dangerougly out of control" actually means. Untrained off lead spaniels are menaces in nature reserves .. I have seen one swim out to a little island and destroy a grebes nest and eggs. There should certainly be a registration system, compusory training and a system to access whether someone is fit to own or have access to dogs.