I waited somere and my BP finally noticed and ate the mouse, he was so desperate to eat that he successfully ate it back first. By grey inside i mean like.. What the mouse looks internally. To explain better, i got a mouse that was furless on a big part of its belly, it was squishy and had that funky smell like all the other mice did, but since the skin was so thin i could see right through it and saw a dark grey color. I often times saw that with the other mice too though, just not that clearly,i just wanted to know if it was normal.