Bonnie, our sheltie, tends to be very fussy with her food and fairly skinny, so someone recommended adding tripe to her Iams food (We changed to that because it has small chunks and she will actually eat it!) She loves the tripe, but then has difficulties going to the toilet,(straining repeatedly without effect) and when she finally manages to to it is very soft and she gets it all over her skirts and stinks to high heaven. We tried it for nearly a week, but still no better. Any suggestions?