It happens to most of us at some time or another. You bend down to give your pet an absent-minded stroke, or a tickle behind the ear, or a tummy-rub perhaps, and your fingers close on something - a bit of pet - that wasn't there before: a lump. And of course, once you've found it, you can’t un-find it. Your mind begins to whirl. Supposing - just supposing - that the lump is actually cancer?