An emaciated elderly dog with a massive tumor was discovered abandoned in Epworth, North Lincolnshire. Still, she was too sick to be saved and had to be put down.

Someone noticed the female King Charles Spaniel on Church Walk in Epworth around 3 p.m. on Wednesday, April 14, and reported it to the RSPCA.

Vanessa Reid, an animal rescuer and investigator, arrived to the scene and discovered the dog collapsed. Since then, the RSPCA has opened an investigation.

Reid said the dog was in such bad shape and was so frail that she would not have been able to walk to this location on her own and was most likely discarded there.

 “It was heart-breaking to see this elderly and clearly underweight dog left helpless in the street in her hour of need," Reid said.

“I believe whoever owned the dog neglected her to such a level she was left dying, and instead of seeking help they callously decided to discard her like a piece of rubbish," Reid added.

She was skinny and had a large growth on her anus. Her backend was collapsed, and her hair around her ears was matted.

The dog was rushed to a local veterinarian for emergency care,  YorkshireLive reports. However, the dog was too sick to be handled.

The poor dog was also not microchipped, reports said. Hence, RSPCA asks the public for help in determining who owned her.

“I am keen to find the person responsible for this and hope someone may be able to tell me who owned the dog. I would also like to hear from anyone who may have seen something suspicious in this area around the time the dog was dumped," Reid said.

Call the RSPCA's appeals line at 0300 123 8018 if you have any information.

If you see a dog wandering alone in the street with no one around, it could be an abandoned dog. Still, it could also be a lost or escaping dog with its owner on the lookout. It could be hungry or thirsty, cold or hot, and it could be run over or cause a traffic jam. Experts have offered pieces of advice here as to how to deal with an abandoned pet.

GettyImages-51309352 LONDON-SEPTEMBER 15: Two King Charles Spaniels join Pro-Hunting groups in a protest rally on September 15, 2004 in London, England. British MPs are today preparing to vote on a hunting ban with dogs in England and Wales. Ministers have indicated they will push the ban through but it may not become law until 2006. Scott Barbour/Getty Images