Laura thats what I do with the eye. Take Kitty for instance Helen said she was about 9 months to a year. Her size would indicate younger but her eyes tell a different story as the white of the eye has brown smudge from the darker areas of the eyes.
The nails is a good tip but not always reliable because many pigs have baby nails that don't grow. Out of my 19 only Jasper, Fleur, Flora and Sunshine have long nails the rest have baby nails so it isn't reliable for my herd!
I wonder if having baby nails is an indication of good health. Maggie who is 5 has baby nails on all paws!![]()