Send a "ʘ‿ʘ" and the Mun will answer ANY question about their Muse.

I recall Jaken mentioning that his true form was a hindrance because his was far less intelligent in that form. With this information in mind, I’d have to say that if circumstances were right (i.e., Sesshoumaru happened to be in his true form around a heap of “stinky things”) that he would.