If you look on LostDog website......every collie that has disappeared seems to have gone after being spooked by a gunshot, thunder or firework!!!
I am very pleased with my Collie.......if we are out walking she will run to me, sit for 3 seconds to get her lead on, then bolt for home..............lead on of off!!! If we are in the field, she just looks at me as if to say 'Did you hear that? I'm going home!!!!!