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The animal rescue charity has launched an appeal after the pup was handed into Birkenhead vets recently.
And the facility reported that she was extremely malnourished and in a vulnerable state.
It is believed that the young bulldog had been used for breeding.
Vets noticed a caesarean section scar on the animal, which alerted them to this.
While a man handed the dog into the Animal Trust Veterinary Surgery on December 6th, he disappeared before staff could take his contact details.
He is said to have told staff he found the dog in heartbreaking condition in Victoria Park.
Vets say the creature "was left like a piece of rubbish to die," adding that it was forced to sleep outside in the freezing cold, and remarking that the her fur was stained with faeces and urine.
They found the dog was suffering from hypothermia as well as various other health issues, such as a severe eye infection which meant she couldn't even open her eyes.
She also had a crusting nose, an ingrown toenail, a serious untreated ear infection and a bad skin condition, as well as inflammation on her paw, which may well have come from standing in her own urine.
Tragically, vets subsequently had to put the animal down because it was suffering so much.
Now the RSPCA is calling for the man, or anybody who knows him, to come forward, releasing CCTV stills of him.
A spokesperson for the RSPCA said: "The RSPCA has released images of a person they hope to speak to, as they continue to investigate the circumstances behind the dumping of a dying young dog in Birkenhead."
RSPCA inspector Anthony Joynes told the Echo that they did not believe the man in the images was responsible for dumping the dog, merely that he could help with the enquiry.
"We are hopeful he will have information which can really help our enquiries. There is no suggestion that we believe this man is responsible," he said.
"This poor bulldog-type dog was in such a bad way - and we really need to find out how she was allowed to get in such a poor condition, and the circumstances behind her neglect and abandonment."
Speaking during a previous appeal, he described what had happened to the pooch as a "catalogue of neglect".
"There is never any excuse for a dog to be left suffering in this way - especially as she was so young," he went on.
"Whoever owned her not only failed her when she was alive but decided to just callously dump her.
"I am keen to find the person responsible for this and appealing for anyone with information as to who owned the dog to get in touch."
Anyone with information should contact the RSPCA's inspectorate appeal line on 0300 123 8018.
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