In reply to Jim C:
I have a dog and he goes on a extendable lead clipped onto my rucksack belt. Never lost him. If I don't need a jacket on the hill he stays at home he doesn't get the option to remove his jacket. Common sense no ?
We even have a life jacket for when he's on the boat. Sounds daft but the handle on his back makes it easy to grab him and move on and off.