I know I know I know this is not uncommon........my 4 month old lab cannot keep her jaws off a rock, any rock, EVER. So far I have not seen her actually swallow one. Probably because I get it out of her mouth or bribe her with a treat to drop it, which she does. I'm just a little nervous of her swallowing one. I know it has most likely happened to many many other labs before. We have a french drain in a small portion of our backyard, which consists of.....lots and lots of rocks. Until we can figure something else out with that, is there a deterrent I could spray on the rocks that would keep her busy little jaws off them? I have tried the Liquid Fence stuff (smells like big time garlic-----yuk) and it does absolutely nothing. The Bitter Apple has worked indoors on some of our furniture. I was wondering if it will work on the rocks. Guess I'll have to try it and see. Any suggestions would be greatly appreciated!