The Mysterious Beach Object My Dog Dug Up

I was taking a routine walk with my dog along the shoreline, where the receding tide had just revealed a fresh stretch of wet sand. That is when he suddenly paused, intently sniffing at something partially buried near the water line. He dug it out and brought it directly to me, clearly intrigued. The object caught my attention immediately, so I picked it up and decided to bring it home for a closer look. Over the next hour, I examined it carefully, turning it over in my hands and studying its shape, surface texture, and any subtle details. Despite taking the time to investigate it thoroughly, I still have no idea what it actually is. The shoreline frequently washes up unusual items, but this particular discovery has left me completely stumped. I am sharing it in the hopes that someone else might recognize it or know exactly what it is. If you have any insight, please share your thoughts. Sometimes the simplest beach walks lead to the most fascinating mysteries, and I would love to finally solve the puzzle of what my dog found that day.