National Pet Memorial Day in US
National Pet Memorial Day in US is held on September 12. Second Sunday of September. This event in the second decade of the month September is annual. 
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National Pet Memorial Day was established by the International Association of Pet Cemeteries (IAPC).
Similar holidays and events, festivals and interesting facts
Catalonia National Day on September 11
National Day of Service and Remembrance in United States on September 11 (September 11 attacks-related observances);
Day of Remembrance of Salvador Allende in Chile on September 11 (The anniversary of the 1973 military coup);
Commemoration of the mass hanging of the Saint Patrick's Battalion on September 12
Día de los Niños Héroes in Mexico on September 13 (in memory of 6 young Mexican cadets who died in the battle of September 13, 1847 during the Mexican-American War);
Beginning of the Week of Remembrance of the Farropiglia Revolution in Brazil on September 13
Battle of Britain Day on September 15 (United Kingdom)