Until about three years ago, I had never heard the term White Line Disease [WLD]. I’m sure our horses had it but it was never enough of a problem to even hang a name on it. I had noticed that certain horses, where they should have had a nice white “ntil about three years ago, I had never heard the term White Line Disease [WLD]. I’m sure our horses had it but it was never enough of a problem to even hang a name on it. I had noticed that “til about three years ago, I had never heard the term White Line Disease [WLD]. I’m sure our horses had it but it was never enough of a”il about three years ago, I had never heard the term White Line Disease [WLD]. I”l about three years ago, I h