National Lost Dog Awareness Day in US
National Lost Dog Awareness Day in US is held on April 23. This event in the third decade of the month april is annual.
Chemists Celebrate Earth Day in USA on April 22 (In 2003, the American Chemical Society joined in on April 22's festivities. Each year, ACS highlights one of four general topics and chooses a theme—this year it's "Our Earth: Handle With Care"—to focus the celebration and highlight how chemists can contribute to a greener world);
Oklahoma Day on April 22 (1889);
National Pet Parent's Day in US on April 24 (Last Sunday in April)