The insurance people insisted that we fitted cameras to our domestic alarm system. The cameras are good fun too, we watch rabbits on the lawn. Deer on the lawn. Foxes crossing the lawn and all manner of birds too.
The cameras show images in colour during the daylight hours but change to a sort of Blair Witch Project creepy night vision in the dark but you can still see what is going on out there. Until it we get a foggy night that is, then all the humidity that comes with the fog creates these bizarre effects with the droplets of moisture twisting and turning in front of the lenses.
Good news for the two Jack Russell Terriers then, you are not redundant yet.
As you were. Carry on barking.