My 10 year old spayed female has been having problems with her bottom lately. Sometimes after she gets up from sitting on the floor, there will either be a spot of bloody mucus or poop on the floor. There was a time when she jumped on my lap and sat down, and there was a lot of liquidy poop that got on me. Yuck! I took her and wiped her bottom, and wiped off quite a bit of watery stool. Her bowel movements have been normal, and her weight is good. She is very active. Any thoughts??