A lot of people say Orf is no big deal. The lambs get it, it goes away in 2-3 weeks and they never get it again.
My take on it is that it IS a big deal. It is a zoonotic disease as I suspect you are aware of. You can get it, even your guardian dogs can get it. The scabs are laden with virus and drop off on your land, contaminating it. The ewes become carriers and can give it to their lambs.
If I were in your shoes, I would immediately quarantine the lambs and ewes to help prevent it from spreading over your land. As soon as they were well, I’d haul them to auction. Spray the quarantine area with Clorox, soak it down. Let it dry and soak it down again.
But from a breeder and make sure to ASK if they have Orf in their flock because some do. They don’t exactly volunteer that information.
Diseases are hard enough to avoid without buying disease and taking it home.
I’m so sorry this has happened to you. I’m also sorry to be the one who just shattered your dream. Please keep your dream, you can recover from this.
I recommend the book Natural Sheep Care by Pat Coleby. In it, she discusses Orf AKA sore mouth. She says if sheep have enough copper, they won’t get Orf. Interesting. There is no cure, if this works it would be awesome. There is lots of good information in her book.
I know you don’t want to hear this, but I’m not sugar coating the truth. You can decide to keep these sheep and you may always have sore mouth. You can try Pat Coleby’s mineral mix and see if your sheep have more lambs with sore mouth. Or you can get rid of them, then use Pat Coleby’s mineral mix just in case your new sheep could pick up sore mouth from your land.
Sometimes you got to cut your losses, let them go and start over. Whatever your decision, we are with you all the way and will give you all the support we can.