The black grownup male canine was discovered by native residents, collapsed in a again alley behind Ripon Street final week (August 16).
He was emaciated and in such a severe situation he was not in a position to walk, so needed to be carried to a vet.
RSPCA inspector Jo Taylor is now investigating the suspected abandonment.
She stated: “The dog, a Staffordshire bull terrier whippet crossbreed, was collapsed and extremely weak when he was found.
“It appears he was deliberately abandoned in the secluded alleyway.
“He is extremely weak and emaciated, but is now receiving veterinary treatment so we are hoping he will pull through.
“I’m very keen to hear from anyone who recognises him or has information about who owns him.
“They can contact me in complete confidence on our inspectorate appeal line number on 0300 123 8018.”