***WARNING: GRAPHIC CONTENT BELOW***
A treasure hunter made the horrifying discovery while magnet fishing in Spalding, Lincolnshire, yesterday afternoon.
Graphic images show the badly decomposed remains of the dog with a plastic bag thought to have contained the bricks.
The man laid the pooch – believed to be a Staffordshire Bull Terrier – on a patch of grass, with open cuts visible on its lower body.
He wrote on community group Spaldinium: “Hi everyone I was wondering if anyone had lost a little staffy type dog with a red collar.
“As sadly while magnet fishing today I’ve pulled one out of the river which had a bag tied round its neck full of bricks and had obviously been drowned.
“I placed him on the bank and informed the police who have informed the council to collect the poor little sod.
“There are some nasty f***ers round here he will be scanned to see if he is tagged.”
A spokeswoman for the RSPCA confirmed they had launched an inquiry and appealed for help.
“Just give me 5 minutes in a locked room with whoever did this”
Colin Peter Mcmahon
“We are aware of this upsetting incident and are investigating.
“Anyone with any information can call us on 0300 1234 999.”
The image has now been shared thousands of times, with locals expressing their disgust.
Colin Peter Mcmahon responded: “Just give me 5 minutes in a locked room with whoever did this, just 5 minutes please please please.”
Linda Beith said: “Evil personified. Find the culprit and do the same to them. Appalling.”
Lincolnshire Police confirmed they are also probing the incident.
A spokesman said: “We are left wondering who would do such a cruel thing.
“There are plenty of charities and organisations that would have looked after and re-homed the dog.
“If anyone has any information as to who owned this dog or who has done such a despicable cruel act, please contact us or the RSPCA.”