I have had Elvis on a RAW diet for about 3 weeks now. I have been feeding natures variety pre made raw. He has been doing EXCELLENT on it. Yesterday, I had the idea that I was going to try and give him a chicken leg quarter to see how he did on it. He ate it and loved it but his tummy unfortunately, did not. His poop has been thick liquid brownish/green. Yuck. I fasted him for 18 hours and started him on boiled rice and chicken. Has anyone experienced this?