Here's my oil story just in case.

My Dane decided she loves mineral oil. She polished off a big batch of bran mash for a colicky horse one time. Well I come home to a nasty smell. Not quite poop but similar. I look around NO piles. I keep investigating. I finally find the source.

My dog was lying there and would make this blurpinggargling sound from her butt and this oil would leak out. She was FARTING OIL!!!!! It was horrible and went on for TWO DAYS. The result was a yellowish oily substance as you are describing.

We have to guard against her getting anywhere near mineral oil. She loves it the freak!

image FFV