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Early Symptoms
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Within the first few weeks of pregnancy, your chihuahua may become more tired than usual. Her behavior (such as becoming more affectionate) may also change.
Appetite
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You may notice that your chihuahua is becoming more hungry, or may even become picky when eating. Sometimes pregnant chihuahuas experience nausea.
Frequent Urination
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Your dog may start urinating more due to an enlarged uterus.
Enlarged Nipples
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If the female's nipples become enlarged and begin to protrude from the body, then it's possible she could be pregnant. The nipples may also darken.
Nesting
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The closer your female gets to whelping, her behavior may become erratic. She may start to shred things or become grumpy.
Gestation
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Most chihuahuas give birth within 9 weeks of becoming pregnant. The closer she gets to whelping, the more agitated she may become, and it is recommended that you have a vet assist in the birth.
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Signs of a Pregnant Chihuahua
It is important that if you notice signs that your chihuahua is pregnant that you make a visit to the veterinarian. Pregnancy and especially birth are difficult for this breed of dog, and only experienced breeders should take the task of breeding these animals.