How much weight should my chihuahua gain during pregnancy?

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We take her on the 16th to get an x-ray to see how many pups shes having and to see if she can have them ok..I was just curious about how much she should have gained during her pregnancy.

I believe all dogs are supposed to gain about 1/3 of their original body weight during their pregnancy. Hope everything goes smoothly! Good luck:)
10 pounds maybe because their so little