The RSPCA East Lincolnshire branch is full of cats desperate for homes.
With more being bought in by inspectors every day, the charity is struggling for space and is appealing to local people to try to help bring the cat population under control.
The RSPCA believes the answer to the cat crisis lies in neutering cats.
Inspector Becky Harper said: “Sadly, 2016 has been a massive step backwards with regard to cat population and all local charities and vets are struggling to cope.
“Social media shows a stream of unwanted cats and kittens, and we constantly see people unhappy that charities are unable to take in healthy cats that people have found straying, that are having kittens in their gardens, that are no longer wanted and that have been bred by accident.
“All welfare organisations have to prioritise what comes into care, ensuring the most vulnerable or neglected animals are looked after first.”
A spokesman for the RSPCA East Lincolnshire branch said: “For several years now we have been trying to put procedures and schemes into place to encourage and facilitate cat neutering.
“It makes us very sad that in 2016 people still don’t understand how vital neutering your cat is.
“Some pet owners may also not realise that cats can get pregnant from four months of age and that this is when they need to be neutered to stop unwanted pregnancies.
“We are being asked to take in cats on a daily basis and we just do not have the facilities to cope with the amount of unwanted felines in the area at this time.
“This year we have already rehomed over 150 cats and kittens and have approx 30 more in care at this time.
“If you are looking for a new cat, adopt, not shop – this saves two lives, the one of the cat you take home, and the space you have created in the kennels.”
If you are thinking of rehoming visit www.rspca-lincs east.org.uk/all-animals