Not since I started trying to change the color
Ah, okay. It seems like users have been having different success rates when it comes to changing their pet's appearence (regardless of color). I wrote about this previously on how I've been trying to change my pet to purple, it's gotten to the point where I'm half-wondering if purple hasn't been implemented into all of the pets. This is just a wild guess on my part, perhaps us both are just having bad luck in regards to this.
@Kallile mentioned that eggplant items helped turn one of their pets purple. It might be worth a try?
But I ain't got a hammer / And I ain't got a pencil / And I ain't got a lasso / So I'm doing it the hard way / Like a post post-modern man