Are "loose dogs" so named due to a lapse of moral convictions , or are they simply "free range" animals ?

I need to know these things to satiate the thirst of knowledge .

2005 Model . Two Fast Eddy stickers , a bell and a clock . She's Lola . She tinkles and keeps time . http://s649.photobucket.com/albums/uu211/britbike05/