We have a horse that has lice. I have read that the lice on the horse can be treated with fly spray. I was wondering what measures we need to take to clean his stall of them. Do we need to spray it down too, or is spraying the horse enough? The horse that has them is now being kept in his stall to try and avoid an outbreak in the other horses. Is that enough or do I need to spray my horse as a preventive measure? They have been pastured together, but the horse that has the lice is sort of unfriendly, so he doesn't get to close to the other horses. My horse doesn't seem to be itching abnormally.