I agree with what has already been said....all sheep,particularly heavy breeds, get hoof rot if the conditions are 'right' for it.......and, as it is infectious, if one gets it the others will if you don't take great care.
As we have a cool and wet climate,foot rot is very common. Scald is also rife when the grass swards get a bit long and the weather is damp and warmish.
I run them through the foot bath (formaldehyde solution) if a couple get affected, whilst treating the 'cases' with iodine spray and tetracycline injections if particularly severe. The formaldehyde foot bath both sterilises and hardens the hoofs and prevents foot (hoof) rot developing in the remaining flock.
If you get foot rot in the herd it is important to move the flock off the muddy or soggy pasture t drier ground if at all possible (not usually possible here!)