The RSPCA has discounted adoption costs for adult animals in Canberra after the centre reached capacity.

The ACT's director of animal welfare Jane Gregor said the centre had been "a full house" for the past few months.

"We had a massive influx of puppies just before Christmas, luckily they've all been adopted, but we've got a continuing influx of kittens coming in," she told 666 ABC Canberra.

"And it makes it difficult for people to take the adult animals when you've got the cute ones here."

To remedy this, the organisation has halved the cost for adult animal adoption for the next week.

"We do have a surrender waiting list for dogs, cats and rabbits," she said.

"So if people are looking for pets, remember the RSPCA.

"They've all been de-sexed, vaccinated, microchipped and they've also been behaviour-assessed so we can determine what sort of household they're suitable for.

"They're all ready to go. It's actually saving you a lot of fees right now."

Ms Gregor said since December 21, RSPCA ACT had 261 animals come into the centre, but had managed to adopt out 215 animals.

She said they currently had over 370 animals in their care.

"Obviously we've got dogs, pups, cats, kittens," she said.

"But we've also got rabbits, guinea pigs, budgies, cockatiels and plenty of other birds."