Oops, it doesn't look like 'adopt a shelter pet pet parents day' is a national day..

Other days

Lash Day

Stud Day

Carpenters Day

Blanket Fort Day

Nae Nae Day

Frozen Yogurt Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Kiss A Brunette Day

Kiss A Ginger Day

Gum Day