At Leicester Animal Aid, in Huncote, there is a waiting list of about four months to take in cats for rehoming – a massive increase from 2008, when the wait was just two weeks.
The charity’s cattery is now full with 35 unwanted pets – and cats are brought in on a daily basis.
General manager Keely Short said there was a particular problem with pregnant female cats and litters being born because owners have not had their pets neutered or spayed.
She said: “The increasing population of cats in our gardens are potentially causing a problem for us.
“If they have diseases, they are likely to infect domestic pet cats.”
The centre has 14 cats ready to go to new homes.
These include six-year-old Mia and Lola and kittens Rudi and Honey, who were just two weeks old when they were abandoned .
Anyone interested in adopting a cat can visit the cattery between 11am and 2.30pm, Monday to Sunday, or call 01455 888257 .