So, in the last month or so we have had the weirdest thing happen to our living room carpet - the outline (or part of an outline) of a circle appears, slightly damp, not smelling of anything and in different places. It is approx. the same size as the base of a round plastic washing basket (see pic) - and I have literally no idea what has caused this! Today I was upstairs for 10-15 mins and came down and one had appeared??? The only suspect around at the time was my dog but I dont see how he could have done this......well not without a compass anyway lol. Just wondered if anyone had ever had anything like this also?