If the small amount of blood that you have seen is bright red - it has probably come from the rectal area (not higher up - or it would be a darker color).
Could you have irritated her little bottom when you washed the poop off her behind? Or could she have irritated her bottom dragging it around? It may have itched from having a poopy bottom....... And her bottom being sore or irritated may be what's causing her to drag her it around.
Hopefully - all of this will turn out to be nothing serious. Good luck!
Carol Jean |