The size of the pups at birth are determined by the size of the dam, the position of the whelps in the uterine horns, and the resources that are available. If your gal was first bred on her 10th day (the average day of ovulation) than a breeding at day 18 probably didn't meet up with any viable ovum. It's going to be expensive to find out for sure but the dam should be fine if she has free whelped in the past.
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Tami |