Welcome to CT. Severe damage and environmental exposure I voted the second 4 without knowing what the poll was for
That dime looks like it didn't pass through just one, but at least two dogs. After the pinch it then sat on the ground until all of the waste had dried up and blew away, leaving behind....just the dime.
might even been in a trash fire and then dug up at a later date (year later by Paddyman98) metal detecting
Perhaps you're better off not knowing. Like the old saying goes "what you don't know won't hurt you".