I made some simple peanut butter dog cookies for the two office dogs and my boyfriend's dog. I'd like to decorate them but the only "dog treat" icing recipes I found online need refrigerated and I'll be flying with some of these. One website suggested for little decorations (all I'm doing) using royal icing or melted yogurt chips. While we grew up allowing the dogs to eat anything but chocolate (duh), I'm not sure about how these guys' owners feel.

Should I bother with a little icing? Or should I just leave them plain?