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Puppies grow up quickly. They start to transition from their mother's milk onto solid foods, a process known as weaning, at around 3 weeks to 4 weeks of age. Before long, those little guys won't be nursing from their mother at all. Instead they'll be chowing down on puppy food.
Mother Dog's Instinct in Starting Weaning. Mother dogs often instinctively determine when to start weaning their youngsters off of nursing so much. This often happens when the puppies are around 3 to 4 weeks in age. Puppies without mothers can also start weaning around this same time period.