Answer:
Pregnant mothers may stop eating a few days before whelping and may also start trying to build a “nest” — hopefully in the whelping box. Many pregnant dogs close to delivery start to pant heavily.
Explanation:
It's normal for dogs to pant, especially when they're hot, excited, or energetic. Heavy panting is different, though, and may be a sign your dog is dangerously overheated, coping with a chronic health problem, or has experienced a life-threatening trauma
