Hi, we are new to Guinea pigs we have 3 boys bought in August. One of the little guys has got sore red feet. There bedding is sawdust and hay. The lower floor is concreate, they have constant access to large run which is grass a small path and wooden logs. We have been letting them out almost every day all day but I'm wondering if the cold damp floor could be causing this. The hutch is fully cleaned new bedding flooring every other day. Is there something we are doing wrong causing this red foot and what can I do to help the sore?