When I spoke to my sister about it, she said she’d found a wrapper on the floor, this means it had been eaten by one of the dogs. Don’t worry I checked, there’s not a lot of chocolate in them, so very little harm if any they can actually do to the dogs thankfully, and they both seem fine.

The frustrating thing for me is my sister almost certainly wouldn’t have mentioned it if I didn’t say anything. Which just shows you that it’s not obvious to others the things that are important to you unless you tell them.