Tanya Rose Ryder (50) fined $8000 and prohibited from owning another animal for five years.
The fine included $3000 for each animal and $2000 for threatening the inspector.
Ryder had a kitten and dog in her care and both had an untreated injury.
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READ NOWThe female kitten Smokey was found unable to bear weight on one of her hind legs after allegedly falling out of a tree.
Smokey was surrendered to the RSPCA WA and taken to a vet for immediate treatment.
Examinations revealed Smokey had an old fracture that had occurred too long ago to be repaired by surgery, so a decision was made to amputate her left hind leg.
Smokey has fully recovered from the surgery and has been rehomed.
Ryder also had an 11-month-old chihuahua called Tiny, who was unable to bear weight on his left rear leg after allegedly being hit by a car two weeks previously.
When the inspector questioned Ms Ryder about treatment for Tiny, she became aggressive and threatened the inspector.
Police attended and Tiny was taken for vet treatment.
Tiny remains with RSPCA WA and is receiving treatment.
The treating vet said if Tiny’s fracture had been treated at the time, it could have resulted in the limb being fully functional.
RSPCA WA Chief Inspector Amanda Swift said when an animal is injured or maimed, the owner is responsible for veterinary treatment.
“No animal should suffer as a result of a treatable injury,” Ms Swift said.
“It is tragic we have to deal with cases like this that are totally avoidable.
“It is also an offence to threaten an inspector who is doing their duty and trying to save an animal who is suffering,” Ms Swift said.
Report incidents: 1300 CRUELTY or www.rspcawa.asn.au.