No they’re ......

not decorations for the season but aids to find where they are when the light begins to go. A has trouble locating them when they decide to take off on their investigations but these lit up collars means there’s no hiding place (TV series from the 70’s?).
Visited a friend at his book binding workshop to pass on some puppy things as he’s getting a new one in a couple of weeks. One of the books being worked on was, prior to the damage it had sustained, was worth £60k......! And it was a paperback!!
A fascinating place with a lot of old equipment which was beautiful in its own right.  They really knew how to make practical things which were also lovely to look at in the olden days.