Part of the problem is likely related to the fact that the drug reduces cholesterol, which is essential for proper fetal development. (articles.mercola.com)
To assure proper fetal development, milk production, and weight, feed gestating and lactating Adult dogs 2 - 3 times as much food as recommended in the Adult daily feeding guide for the weight of your Adult dog. (chewy.com)
There are many other micronutrients that aid proper fetal development, and there exist myriad sources of information on what pregnant women should or shouldn't eat or do. (calculator.net)