The message
from SusieThompson contains these words:

We've just found a six inch long leopard slug wandering over our living
room floor. The only way, we think, that it could have got so far into
the house was up through the floorboards! At least it was heading for
the kitchen door and out into the garden. Keith picked it up in a bit
of kitchen roll (yuck), and popped it out onto the far side of the
garden, well away from our plants. Is this a record for a slug found
indoors?

No :-(. At our last house I once found a huge pair having intimate
relations half way up the sitting room wall, in winter. They can easily
get into old stone houses in rural west Scotland, which often have
little or no below-ground foundations and just raw earth beneath the
floorboards. There are often gaps in the walls' mortar where slugs can
hide. If your dog leaves any trace of food in its dish overnight, you'll
probably find some slime trails around it; or if you have a sack of dog
food indoors that's another likely slughome.

Janet.