There may be many reasons for giving birth to deformed dogs. Here are some common reasons:

Genetic factors: some dogs The breed may inherently have some genetic defects that may cause deformities in the offspring.

Maternal health problems: If the female dog is infected with disease, malnourished or otherwise adversely affected during pregnancy, it may affect the normal development of the fetus.

Environmental factors: Exposure of female dogs to certain chemicals, radiation or other harmful environments during pregnancy may also cause fetal malformations.

Drugs and toxins: Certain medications or toxins used by female dogs during pregnancy may cause harm to the fetus.

Abnormalities during pregnancy: For example, the pregnancy period is too long or too short, the fetus is in an abnormal position, etc., which may increase the risk of malformations.