Gypsy, the Equine Encyclopedia, has something to say about white line or “seedy toe.” Like all shetlands, she is always watching, learning and listening.
White Line affects the rim of the hoof.
It is named this because it weakens the white line of the hoof. The infection begins at ground level and works its way up, eating away the white line and making a hollow pocket between the hoof wall and the sensitive laminae.
To treat white line, the infected tissue must be cut away and the space should be disinfected. In severe cases, corrective shoeing may be needed. Luckily, most cases of White Line are minor and horses recover quickly.