I've heard it before with cats to describe oily spots on the tail where there are weird deposits. Never seen it myself though.
Did a quick google search, and it's all re: cats. This might help though.
http://www.provet.co.uk/Petfacts/healthtips/studtail.htm
Did a quick google search, and it's all re: cats. This might help though.
http://www.provet.co.uk/Petfacts/healthtips/studtail.htm