Gotta love my dog...
She eats everyone's socks but mine, for the simple reason that I hardly ever wear socks, even in the winter. She's never eaten anything of mine before, thank goodness. So we all went to the beach this summer, and I was so excited to find a long whelk egg case. So cool, as it just washed up on the beach and was in perfect condition. It even had little baby whelks inside. I brought it home, dried it out, and displayed it in our front window. A few weeks later I noticed that it was gone. The only explanation was that the dog ate it. I showed her another whelk egg case that we found (this one was a lot smaller), and she tried to eat it. Mystery solved, my dog has a liking for seafood!