Mine are in inside pens during the bad weather and at night in the summer. We have lots of oldies who are arthritic and thin so they need to be 'stabled' over winter- we have also had horrible winters for the last 2 years.
If they have problems with their feet, jkeep them well trimmed and if they go lame wash them and get some alamycin spray ( blue/ green spray) from the vet. Spray it on and keep them dry overnight, after a couple of days they should be better. We have to do this almost weekly with some of our sheep!