Oops, it doesn't look like 'what if cats and dogs had opposable thumbs day' is a national day..

Other days

African Immigrant And Refugee Hiv And Hep Awareness Day

Tell Ur Crush You Like Them Day

Ormille Day

Boyfriend Day

Girl Friend Day

Brow Day

Eat What You Want Day

Pick Me Day

Unicorn Day

Kiss A Brunette Day