I have a two year old heifer who is limping badly on her back leg. Her foot is swelled, I see no pus or anything. I'm not sure if she stepped on something, sprained or hoof rot(someone please define). She is not handleable(if that is a word) and we don't have a shoot or anything to contain her in to check it out. I have had her penned up out of the mud for the last couple of day. Is there something i can give her as a preventive measure. The vet we use, will not work on a animal not contained, an he's the only one we know. I'm assuming she's bred by now. Any thoughts?