Number of cats and dogs entering shelters each year: 6–8 million (HSUS estimate).
Number of cats and dogs euthanized by shelters each year: 3–4 million (HSUS estimate).
Number of cats and dogs adopted from shelters each year: 3–4 million (HSUS estimate).
Number of animal shelters in the United States: Between 4,000 and 6,000 (HSUS estimate).
Number of cats and dogs reclaimed by owners from shelters each year: Between 600,000 and 750,000—15–30% of dogs and 2–5% of cats entering shelters (HSUS estimate).
Percentage of dogs in shelters that are purebred: 25% (HSUS estimate).
Average number of litters a fertile cat can produce in one year: 3.
In seven years, one female cat and her offspring can theoretically produce 420,000 cats.
Average number of kittens in a feline litter: 4–6.
Average number of litters a fertile dog can produce in one year: 2.
Average number of puppies in a canine litter: 6–10.
In six years, one female dog and her offspring can theoretically produce 67,000 dogs.
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