New Core Hound pet look.... :)

Would anyone be able to tell me what happened for my pet to get that amazing color? I noticed yesterday after I had completed my Korthia dailies and was getting ready to log off for the night. So after zoning to my garrison, I took that screen shot.

I’ve tried to figure out how that happened and how I can get it back. I would love if there was a glyph I could get so I can have it when I want it.