A vet confirmed the dog was severely underweight and had several inflamed wounds on its gums, possibly from chewing on something which damaged its mouth.
It was also covered in wounds, believed to be pressure sores. However, the sores did appear to be healing, said Mrs Judd.
The dog had no registration tag and had not been microchipped. It was believed to be between two-and-a-half and three years old.
Ms Judd said she was horrified by its condition.
"This is one of the worst cases I have seen. I could see every vertebrae and rib on this dog. She had been mistreated for quite some time, but despite this she has a loving, trusting nature."
The dog would now undergo treatment and care with the view to finding it a new home.
Mrs Judd said animal control staff were keen to hear from the dog's owner, or any information from the public that could help identify the owner.