Humane Society International/India in a release here said it would offer a reward of up to Rs 1,00,000 for information leading to the identification, arrest and conviction of the person responsible for sexually assaulting the dog.
"While the exact location of the incident and whereabouts of the dog are not known, it is believed that it occurred in the state of Kerala since the perpetrators were talking in Malayalam," it said in a release.
DGP T P Senkumar told PTI that he has received a complaint in the matter.
The organisation, which has also sent the two-minute video to media, said it was widely circulated on Whatsapp and shows a helpless dog being forcefully held by a person and raped in a dilapidated building.
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The dog is seen trying to free itself numerous times while it is being held by force and subjected to bestiality. "The nature of this barbaric treatment clearly indicates that the dog has undergone severe physical and mental trauma," it said.
He said the organisation was also working with the Animal Welfare Board of India and Kerala police to see that the persons involved were duly punished.