Pregnant women should not have a dog during pregnancy, mainly for eugenics. Because dogs are prone to parasites, especially Toxoplasma gondii, and women’s immunity is low during pregnancy, which can easily lead to a Toxoplasma gondii infection during pregnancy. If infected with Toxoplasma gondii, it poses a great risk to the health of the woman and the fetus. First, Toxoplasma gondii infection in early pregnancy may lead to miscarriage. Secondly, it may lead to fetal malformations, such as hydrocephalus, and may also lead to liver and brain lesions and mental retardation in newborns after birth. Therefore, it is best for women not to keep pets such as dogs or cats after pregnancy in order to avoid the impact on the body and the fetus, resulting in adverse consequences.