That's right. Good ol Ogre is actually an angry bobcat (pitched down). The specific sample was taken from a sound effects cd: "Totally Gross Sound Effects From Hell" (1992). ID was known to use animal sounds for enemies, the sound of imps in Doom was actually from a camel. A lot of their source material came from sound effect library's such as mentioned, mostly CD format.
So why this topic? Well at some point i would like to redo the sound effects of Quake in high quality as close to the originals. For this, it would be important to know which sources were used or might have been used. If anyone else knows of good sound sources from that era (or better know of an exact match) post them here so the HD sound pack may someday be realized.
