The owners of a southern Victorian farm say the discovery of dozens of slaughtered rabbits on new year's morning was like something out of a horror movie.

Twenty-two rabbits were crushed to death at a property at Garfield, south-east of Melbourne, sometime between midnight and 3am AEDT on January 1.

The rabbits were being bred for commercial purposes.

Kara Jackson says she went to give the rabbits water in the middle of the night and found them scattered around the shed.

"You're looking at it thinking, this doesn't happen in real life, this is something from a horror movie," she said.

"This doesn't happen on your property in the middle of the night in the middle of nowhere."

Leading Senior Constable Colin Beard says police are investigating if several drunken revellers were involved.

"The rabbits were killed by having their heads crush and being thrown against the walls of the shedding," he said.

"It's disgusting a very, very sad scene."

Police say whoever attacked the animals may have been injured because the rabbits were prone to scratching.

In a separate incident, a cat was found decapitated and dumped on the front lawn of a property at The Basin, in Melbourne's east.

Senior Constable Nick MacDonald says police are yet to find the owner of the cat.

"This was a horrific way to treat an animal and very distressing for the owner of the property to have found," he said.

Allie Jalbert from the RSPCA says the attacks are sickening.

"Unfortunately we do see these types of horrific cruelty cases far too often," she said.

"The thing that's really concerning about a case such as this, is if somebody can viciously attack and kill an animal like this what can they do to another person as well."