My baby boy, "Tiger" (who just turned 23 on my birthday) has a sad white hoof. The farrier accidentally cut it and it bled like crazy. Turns out it's something not like what people get called a "canker" but it can turn into cancer. I hate mud and we have had too much of it. Tiger stood around in a muddy pasture area to eat his hay. (He won't come in the barn to eat it most days)
We're working very hard with him to keep this getting better. It already looks better.