Nine-month-old Minnie was covered with maggots following its physical and sexual abuse ordeal in Woking, Surrey, and an investigation has been launched to find the perpetrators of the attack.
The cat was found on Sunday and is now being cared for by vets who have described the attack as “heartbreaking”.
She had a makeshift splint on one of her front legs and was unable to walk on her back legs because of nerve and tissue damage.
Rachel Butler, from the RSPCA, said: "The great news is she has started to walk around a little bit, she's very wobbly still but it's a great sign and she has had the dressing removed from her large wound.
"She is hopefully going to be discharged from the vets today and be transferred to our Millbrook Animal Centre. She seems to be heading in the right direction which we're so pleased about."
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The RSPCA is appealing for information as to how the pet became critical.
Liz Wood, deputy manager at Millbrook Animal Centre, said: “We have never seen a cat so abused before and it is heartbreaking that this has happened to her.
"It appears she may have been severely abused and she has a number of wounds full of maggots.
"The vets believe these may have originally been burns as she had candle wax all over her tail. She also shows signs of having been sexually abused – it is absolutely awful.
“Minnie also had a makeshift splint on one of her front legs and is currently not able to stand on her back legs so we think she has some soft tissue and nerve damage as her x-rays are clear of any fractures.
“She isn’t out in the clear yet but we are hoping she will make a recovery as she is very bright and a little fighter."