A man has been charged over an alleged attack on a cat that had just given birth to a litter of kittens, leaving it paralysed, in the state's Hunter region earlier this month.

It will be alleged a boy saw a man swinging a cat by her tail and hitting her against a trailer on May 6.

Princess the cat was left paralysed after the alleged attack. Credit:Sawyers Gully Animal Rscue

Police said the boy called out to the man before alerting his mother.

The boy and his mother believed the cat, which had just given birth to a litter of kittens, had died. They then found the animal, who suffered a broken spine and legs, had returned to her kittens the next day.