Authorities in the US say a dog bit off the hand of a four-year-old boy after he stuck his arm through a fence to try to play with the animal.

Fire department officials in the city of Layton, Utah, say the child was airlifted on Sunday to a Salt Lake City hospital and was in serious but stable condition.

Battalion Chief Jason Cook says the boy had a sock on his arm when he put it through a gap between the ground and a solid vinyl fence in his backyard towards two huskies living next door.

His family tried to limit the bleeding until emergency workers arrived.

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Authorities couldn’t find his hand and are almost certain the dog ingested it.

Animal control officers took custody of the dogs.

AAP

4KQ 693AM Brisbane