foot care

Hello: We have two Nigerian Dwarf wethers that are around 6 months old named Randy and Jesco. I noticed that one of them (Randy) has a cracked hoof. It appears to be on the outside wall and it is on his back leg. I tried to get a good look at it and it appears that it is cracked too far for me...

So I feel like it's time to change a few things. Mainly the hay and minerals I feed out, the vaccinations I give, the general lack of secondary supplementing(i.e. boluses, mineral/vitamin injections, extra feed additives), the routine hoof care I give and their shelter situation. I'm having...