It doesn't seem to me that puppets are very well behaved at all. Well no, puppets are rarely up to Mom's Etiquette. This has to do with their paying attention on stage. When a puppet is on stage it should always be at attention. Avoid resting your arm on the stage between speaking parts.
Nobody likes to talk to a sleeping puppet.
Little motions tell the audience that the puppet is alive and well. And please make sure your puppet stays the same height on the stage. As your arm gets tired, you tend to let it relax. The result is that your puppet gets shorter. Don't let your puppet waver in the wind, leaning this way or that.