I recorded the sound of my dog's collar using a zoom h4n recorder and a rode m3 microphone. This would be a good sound used in the background in an outdoor scene. I can imagine this recorded noise starting off soft and gradually getting louder to indicate a dog walking by before it softens up and gradually trails off as the dog gets further and further away.
I discovered freesound thanks to my music acustics teacher and i tried it this morning. I think it's very interesting and funny so i created a file on audacity software and i could load it here: it's my chihuahua's bark.