Is It Normal For A Dog To Pant Heavily Two Days After Giving Birth?

No it is not normal for dogs to have excessive panting 2 days after delivery of puppies. Excessive panting in dogs can be due to many reasons. Common reasons of excessive panting are

1. Heartworm
2. Hypothyroidism
3. Poisoning
4. Anemia
5. Fever
6. Conditions of fear and excitement

So, get an appointment from your local vet and take her to him for proper diagnosis and treatment.

Your dog is showing signs of milk fever which is caused by low calcium. She needs to see a vet right away. She has to be treated with an IV with calcium. Make sure your bitch doesn't stay in with her puppies all the time, the puppies will deplete her calcium nursing. Also you may want to give her calcium supplements.