Here's why:
* Focus: Giving birth is a physically demanding and intense process. Dogs are usually very focused on the task at hand and don't have the energy or inclination to growl or bark.
* Pain: While some dogs may whimper or whine due to discomfort, most are more likely to pant, breathe heavily, and focus on pushing out the puppies.
* Instinct: A mother dog's instinct is to protect her puppies. Excessive noise could attract unwanted attention or predators, putting her and her pups at risk.
However, there are some exceptions:
* First-time mothers: First-time mothers might be a bit more vocal due to nervousness or uncertainty.
* Stress: If a dog is experiencing significant stress or complications during labor, she may vocalize more, including growling or barking.
* Individual personality: Some dogs are naturally more vocal than others, and this might be reflected during labor.
If you notice your dog growling or barking excessively during labor, it's important to contact your veterinarian immediately. This could be a sign of distress or complications.