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The puppy begins developing inside the mother dog's womb. During this time, the puppy is a tiny embryo and grows rapidly. By the end of the prenatal period, the puppy has developed most of its organs and body systems.

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At birth, puppies are blind, deaf, and completely dependent on their mother for food and warmth. They spend most of their time nursing and sleeping. Their eyes and ears remain closed, and they rely on their sense of touch and smell to find their mother.

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The puppy begins to open its eyes and ears, becoming more aware of its surroundings. At this stage, the puppy begins to grow stronger and start moving around more, exploring the environment, and interacting with littermates.

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The puppy continues to grow rapidly and starts developing more coordination and control over its body. This stage is marked by increased independence, and the puppy may begin testing boundaries.

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The puppy transitions into adolescence and may experience a "teenager" phase, where it can be more rebellious or energetic.

This is when the dog’s personality fully emerges, and it may become more territorial or assertive.

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The dog has reached full physical and mental maturity. Adult dogs are typically calmer and more settled, having passed the stages of high-energy playfulness and curiosity.

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As dogs age, they may start to slow down, and signs of aging, such as gray fur or arthritis, may appear. Senior dogs may need special care, including a senior-specific diet, more frequent vet visits, and attention to their mobility and mental health.