[natassja72]

I'm not sure if this adds to the topic, but I have noticed recently that some captured pets change color on their own when battle starts. For example, I captured rare (blue) Cat in Arathi Highlands yesterday. During original fight, the cat was black, when I put it into my team, it appeared in different colors during multiple pvp fights I had with this team that evening (I remember orange or sand-colored, and even black once later on). So it seems as if some pets don't use one set color.
And one more thing, if it's of any importance - the cat was the second pet that joined fight, cats don't seem to exist in Arathi Highlands on their own.