Air bubbles

This story is a little embarrassing so be prepared.

We recently cut Bailey's hair again (to keep it short but allow it to get a little longer before Winter). Normally, I could handle questions from my kids without panicking. I guess I wasn't prepared this time. Sweet Pea happened to notice a set of private parts that boy dogs carry around. When asked what they were, I freaked at how to explain this to a young child (which is not the typical me...it could be the illness my body was apparently trying to fight off). I responded, "Those are air bubbles. He just needs to poot." She bought the answer but I have a feeling that I should prepare because the question is sure to arise again when he poots and the "air bubbles" don't go away.