Because this horn is undamaged it will have a low porosity and will not readily absorb environmental water. These hooves will certainly be dry but because they are strong and keep shoes on without cracking and peeling it is probable that nobody will comment on them being TOO dry. It is really only hooves falling into the first category that will be termed TOO dry. As that is because most people think that is the problem. In reality wetting these feet never makes things better, but the myth continues in tradtion.
More water is never the answer.
Keratex Hoof Hardener is. The observer sees the hooves dry out and then assumes that the brittleness is due to a lack of water. I hope you now know better. In many parts of the US where there is very low rainfall, and in desert areas horses feet will be like iron and they they keep shoes on without cracking. If the structure is undamaged it is unlikely the hooves will be either too hard or too dry.