There are two slimes I have control of in the forest, and it's totally possible to meet them, but no, this goat just has a very broken leg- you got some really good rolls!
@Sevak: Oh, that's what it was. The red stuff was the same red stuff that was in the small furry things that dropped stuff on the slime. The hard slope on the creature had to be similar to the hard white things that those creatures had in them as well- but just bigger because the creature was bigger. The big white thing with a stuck leg seemed to use up its energy, as it finally just laid down and air from its front went in and out faster than it was before.