How can one justify not allowing a dog into the house for a Christian wife, knowing that it is mentioned in the noble Hadith?

A Muslim should choose a righteous wife to secure his children, home, and wealth. Marrying women of the Scripture (Jewish and Christian women) is permissible in principle according to Sharia (definition), provided she is chaste and that the children are under the guardianship of the Muslim. However, refraining from such marriages is preferable due to the potential consequences. As for keeping dogs in homes, it is forbidden except for hunting or guarding, due to the harms and corruptions involved, including diseases transmitted through them.