My boyfriend's cat Memphis is suffering something awful. We think he is constipated, as he will eat, run over to the litter box and squat, only to sit there for a couple minutes and nothing comes out. He seems to be very uncomfortable and maybe even in pain. My boyfriend and I are both worried about him. Should we be very concerned, or is there something we could try and we shouldn't be too worried yet? This has been happening for a day or so. We bought some wet food to give him, thinking that would loosen his stool a little bit. Thank you for any advice.