if you put hoof oil or hoof grease on the hooves trust me you'll see a massive improvement and im talking from experience!
I found with my horse that when he threw a shoe and just had 3 shoes on the hoof with no shoe, the cracks in it get a lot wider very quick!
Talk 2 your farrier about it coz its his job to know what 2 do:)
Hope you get it fixed:)
Sorry the message is confusing to read! My heads a bit jumbled at the min!
a silent night,wen friends are few,I close my eyes nd tink of u.A silent night,a silent tear,a silent wish dat u wer here♥ Is maith liom cŕca milis:) lol