one of my hens was limping last night so I checked out the bottoms of her feet and both of them had small round black spots-is it common for them to get bumblefoot on both feet identically? No signs of redness or swelling and today she is walking fine but... maybe I am just being over cautious? She seems to be walking fine today! Just to be on the safe side, I dipped her legs in olive oil in case she had some leg mites but her legs looked clear to me... Thanks in advance!