All pets sometimes do stupid things, and in most cases they never miss a chance to miss a chance and... not have enough time to hide the scene of their performance. But if you think that they don't feel bad about it, don't dare you hesitate - oh yes, they do feel ashamed, and they don't ever hide it from you. And yes, they can't speak out loud, but they can obviously use other ways to express their sadness and pity, and believe us, these ways are much easier to understand than just hearing their "Sorry"!