World Spay Day
World Spay Day is held on February 23. Last Tuesday in February. This event in the third decade of the month February is annual. 
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Annual campaign Humane Society International and Humane Society of the US.
Spaying prevents uterine infections and decreases the incidence of breast tumors, which are malignant or cancerous in about 50 percent of dogs and 90 percent of cats. Spaying your pet before her first heat offers the best protection from these diseases. Generally, spaying or neutering your pet will not change its personality. If there are any effects on behaviour, they tend to be positive (reducing unwanted behaviour). Spaying or neutering will not change your pet's affection level or playfulness. For females, there is typically no change at all.
The procedure typically can last from 20 to 90 minutes to perform, depending on your pet's size and any special medical considerations. In older pets or large-breed dogs, the procedure can take longer and may require two surgeons to perform.
In fact, the studies show that spay actually increases aggression, fearfulness and anxiety in the recipient, as well as making them more difficult to train.
Similar holidays and events, festivals and interesting facts
Cat Day in Japan on February 22
Walking the Dog Day on February 22
Birthday of Scouting and Guiding founder Robert Baden-Powell and Olave Baden-Powell on February 22 (and its related observance: - Founder's Day or "B.-P. day" - World Organization of the Scout Movement);
World Thinking Day on February 22 (World Association of Girl Guides and Girl Scouts);
Crime Victims Day in Europe on February 22
World Encephalitis Day on February 22
European Day for Equal Pay Men and Women on February 22
Be Humble Day on February 22
Single Tasking Day on February 22
International Dog Biscuit Appreciation Day on February 23 (The first dog biscuits were developed in the mid-19th century by American manufacturer James Spratt);
National Dog Biscuit Day in US on February 23
Play Tennis Day on February 23
Curling Is Cool Day on February 23
World Information Architecture Day on February 24 (World IA Day is a one-day annual celebration hosted by the Information Architecture Institute and held in dozens of locations across the globe);
World Bartender Day on February 24
Inconvenience Yourself Day on February 24 (is celebrated on the fourth Wednesday of February of every year)