RSPCA WA has revealed the number of unwanted kittens they receive has doubled in the past three months, putting increasing pressure on their foster network.
The influx of kittens and foster cats has been prompted by the warmer weather and a surge in unchecked breeding.
Among the unwanted felines was Cali, a seven-week-old tabby kitten who was dumped in a cardboard box on RSPCA's doorstep last Saturday morning.
The flood of unwanted kittens the RSPCA is receiving is putting a strain on its already stretched foster network.
Last financial year, RSPCA WA cared for 932 cats and kittens, which was 28 per cent more than the previous year.
RSPCA WA Shelter Manager Emily Smith said it is animal shelters and rescue groups who are left to pick up the pieces during breeding spikes.
"An unsterilised female cat can give birth to more than 200 kittens in her lifetime," Smith said.
"Please, if you are the owner of an unsterilised cat, talk to your vet about desexing as soon as possible, and keep your feline friend contained to prevent unwanted litters and protect wildlife."
As a result of the number of incoming cats they're receiving, RSPCA WA is pleading for the public's help.
RSPCA WA provides foster carers with everything required to care for their temporary pet, including food and pet supplies, all vet treatment, behavioural advice, and medications.
"If you've been thinking about welcoming a feline friend into your life, now is the perfect time to adopt from a shelter," Ms Smith said.
"By giving a cat or a kitten a second chance, you're making room for more animals in need."
To learn more about fostering, or express your interest, visit rspcawa.org.au/foster-care.