I believe he's losing the popular blues, but I'm liking this transition!
Does he stay outside Max? I know it gets pretty humid there, and with this heat weve had he may just be trying to compensate for the ambient temps.
He could just be trying on different shirts though, but I thought Id mention the temp thing, just trying to look out you know.
Donahue got slowly more yellow last summer, and he got really yellow as it got hotter. I didnt realize how hot he was getting. Took measures to keep him cooler and he went back to normal.