We got two new chipmunks last week and when we got home last night we noticed the usually really active chipmunk (Nip) had a cut / gash behind her front arm. After checking the branches to make sure it wasnt that we thought it may of been her sister, maybe a small playful fight do you think this is possible as they are sisters? I spoke to my vet today who advised that we shld keep an eye on her and if she starts to not sure the arm to take her in to see him, but as you can imagine we are worried about her!