Dogs are a man's best friend, and for many, cats are, too.

But the harsh reality is that in 2015, 82,902 dogs and cats were put to sleep nationwide, with cats making up 67,091, or roughly 80 percent, of the total due to their high reproductive capacity, according to the Environment Ministry.

The ministry estimates that one unsterilized female feline will increase the cat population by 2,000 over three years.