The RSPCA is investigating an act of horrific animal cruelty after a dog was stuffed into a suitcase and dumped in a garbage bin room at an apartment tower in Melbourne's CBD.

Residents at the Upper West Side apartment building on Lonsdale Street were recently told that the body of a husky dog had been found dumped in the bin room.

Part of the notice sent out to residents after an animal cruelty incident.

The one-year-old dog was believed to have been knocked over the head and then stuffed into a silver suitcase, where it suffocated and died.

The company in charge of the building, Australian Property Management, sent out an email last week to residents asking them to help find the dog's owners.