Celia Hammond Animal Trust is offering free cat neutering on Tuesday to mark National Spay Day.
The animal charity, in Canning Town, provides subsidised neutering for owners on a low income and on Tuesday, 30 owners will be able to have their cats spayed for free.
It is part of a national campaign to raise awareness of cat neutering, with animal welfare charities aiming to combat the belief that cats should be allowed to have one litter before being spayed.
The charity deals with hundreds of stray, unwanted and abandoned cats each year, with neutering helping to reduce the number of unwanted litters.
It rescued over 200 cats and kittens from the site of the Queen Elizabeth Olympic Park before construction work began and routinely takes in animals that have been living on the street.
Celia Hammond, who runs the clinic and rescue centre, said: “The situation is getting worse every year.
“We see first hand the effects of the increasing cat population, helping those living in hostile conditions on the street.”
The free neutering will be available to the first 30 qualifying people to call the clinic on 020 7474 8811 and book an appointment.
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