Pregnant dogs will exhibit several physical and behavioral differences throughout the course of their pregnancy. The physical changes occurring within their body will likely cause them to change their daily routine. For example, a dog's weight gain is often attributed to their lack of energy and need for more hours of sleep.
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Nesting behavior
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Nesting behavior is quite common in pregnant animals as well as humans. Pregnant dogs may show signs of this by tearing up paper, blankets or other materials to make a "nest" for their pups.
Mothering
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Throughout a female dog's pregnancy, she may exhibit early signs of mothering, such as taking on an object or toy and treating it as if she were its mother. Mothering behaviors might include carrying the object with her wherever she goes (especially to sleep), routinely cleaning the object by licking it, and becoming aggressive when someone attempts to take the toy away.
Weight gain
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Weight gain on a pregnant dog will typically be seen after the fourth week of pregnancy. The added weight will often cause a dog to become less energetic and exhausted more easily. As the pregnancy continues, the female may shy away from all exercise, preferring to sleep or simply lie about the home.
Attention needs
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Female dogs when pregnant may begin demanding more attention from their owners or other visitors. However, other females may isolate themselves away from others, especially during the early stages.
Hunger
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Pregnant dogs will show a noticeable increase in hunger throughout the 63 days of pregnancy; however, just how much differs from animal to animal. In the last week before the pups are delivered, the female will be eating two to four times her average amount.
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