Question about breathing

I have been watching Tiara's breathing very carefully the last couple of days. Last night her breathing went to what I would say is a human pant. The only time it is slower is when she sleeps. Could this be the start of labor? She is over 65 days, but I'm not sure how many.

Dora has been breathing the same way. It slows when she sleeps but otherwise it is fast. I don't know what to think either.

We need an expert to answer this one.