Mass killing of pets in 1939
The British pet massacre was a week-long event in 1939 in which an estimated 400,000 cats and dogs, a quarter of England's pet population, were killed so that food used for animals could be reserved to prepare for World War II food shortages.
Background.
In 1939, the British government formed the National Air Raid Precautions Animals Committee (NARPAC) to decide what to do with pets before the war broke out. The committee was worried that when the government would need to ration food, owners would decide to split their rations with their pets or leave the animals to starve. In response to that fear, NARPAC published a pamphlet titled "Advice to Animal Owners." The pamphlet suggested moving pets from the big cities and into the countryside. It concluded with the statement that "If you cannot place them in the care of neighbours, it really is kindest to have them destroyed." The pamphlet also contained an advertisement for a captive bolt pistol that could be used to kill the animals humanely.
Incident.
When Neville Chamberlain announced on 3 September 1939 that Britain had declared war with Germany, many pet owners took their pets to pet surgery clinics and animal homes to have them put down. Many veterinarian groups such as the PDSA and the RSPCA were against these drastic measures, but their hospitals were still flooded with pet owners in the first few days. PDSA founder Maria Dickin reported: "Our technical officers called upon to perform this unhappy duty will never forget the tragedy of those days." Hilda Kean wrote that lines for London clinics stretched a half mile. The event triggered a shortage of chloroform and a waste management challenge. 
A year later, when London was bombed in September 1940, even more pet owners rushed to kill their pets. "People were worried about the threat of bombing and food shortages and felt it inappropriate to have the 'luxury' of a pet during wartime".
Battersea Dogs &amp; Cats Home, against the trend, managed to feed and care for 145,000 dogs during the course of the war and provided a field in Ilford as a pet cemetery, "where about 500,000 animals were buried, many from the first week of the war". A famous opponent of pet culling was Nina Douglas-Hamilton, Duchess of Hamilton, a cat lover, who campaigned against the killing and created her own sanctuary in a heated hangar at Ferne.
Legacy.
In 2017, historian Hilda Kean published a book about the event called "The Great Cat and Dog Massacre."
References.
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