The timeline for these changes and the arrival of puppies is as follows:
* Mammary gland enlargement: This usually starts around 3-4 weeks into pregnancy, though it can be more pronounced in some breeds later on.
* Milk production: Milk production typically begins a few days before labor starts.
* Labor: Labor usually occurs between 58-68 days after breeding.
Important note: The exact timing of mammary gland changes and labor can vary based on the individual dog's breed, age, and overall health.
It's crucial to consult a veterinarian for guidance on a specific dog's pregnancy and labor, as they can assess the situation and provide tailored advice.