Well, I am finding that anything small enough to fit into Merries mouth, will end up in her mouth one way or another, she is like a little vacuum!  So the obvious, like plants, electrical cords or any debris that you might or might not see, she probably will find, and want to taste!  Basically, if I leave the room, I put her in her x-pen, that way I know that she will be safe, even if it is only for a minute.  I also am finding that if there is an area small enouh for her to fit through, she will try to get through it, and she is very persistant! If I take her away from something that she can't have, she will keep going back to it, until I have removed it, and she is confident that it is gone, it is quite funny to see actually, they are very smart little dogs, and have a one track mind.  I am also noticing that if we have been working on a training method for a week or so, and then slack off once, she remembers that one time, not the whole week of practice, lol, like I said, they are really smart!  I hope this has been a little bit helpful!