The phrase "unaltered cats" refers to cats that have not undergone any surgical procedures to remove or alter their reproductive organs, such as spaying or neutering. Full definition
By removing the cost barrier to obtaining a cat from the shelter, the agency hoped to reduce the number of unaltered cats in the community and provide support for more cat owners. (aspcapro.org)
Even with the best of intentions, accidents happen and those accidents with unaltered cats result in another litter. (jasonheigl.foundation)
Furthermore, the adoption counselors understand people have the ability to acquire cats through other means, consequently resulting in unaltered cats contributing to the litters of kittens being surrendered to the shelters, or given away free, exponentially increasing the numbers of kittens born. (maddiesfund.org)