The Glossy Goat!

I saw this quaint business when I was at a neighboring town working for a client.  Click the picture to enbiggen.

I have heard many goat idioms in my life.  Get one's goat, act the goat, eats like a goat.  I have never hear of glossing a goat.  I have no idea how that would happen.  Does one shellac the goat (which is now a phrase I shall use regularly)?  And once one has a shiny goat, what does one do with it?  So many questions.