An American Staffordshire Terrier that was pepper-sprayed, tasered and shot by Queensland police after it attacked a courier driver, will have its leg amputated, the owner says.

Key points: The American Staffordshire Terrier was shot as a last resort, police say, after it also attacked an officer

The American Staffordshire Terrier was shot as a last resort, police say, after it also attacked an officer The owner says the courier company had been told not to enter the property

The owner says the courier company had been told not to enter the property The dog will have to have his leg amputated as a result of the gunshot wound

Police said the dog was shot by an officer at a property at Redridge, near Childers, as a last resort, with the courier driver forced to seek refuge in the home to escape.

Owner Bonnie Chaplin is in shock over the incident, saying she returned home on Monday to find her family's 10-month-old puppy Chaos had suffered a gunshot wound to his leg.

"I rushed home from town and when I arrived there was the courier driver here and a police officer here," Ms Chaplin said.

"He explained to me 'I've pepper sprayed your dog, I've tasered your dog, kicked him in the head and pinned him to the ground under my foot and shot him'."

Ms Chaplin said she found the dog "dragging his leg" and there was blood everywhere.

Fastway Couriers said the driver suffered bites to his arms and legs requiring stitches. ( Supplied: Bonnie Chaplin )

She said the courier company had been told previously not to enter the property, and the parcel could be left without a signature.

"The courier has come through locked and electronic gates, and he used an override switch on the gate to get access," she said.

"The parcel that he had was no signature, there was no reason that he needed to walk the 50 metres into the house.

"The parcel was actually small enough to fit in our mail box. The dogs are protecting our home and our kids."

She said the courier driver entered her brother's flat after the attack.

The Queensland Police Service confirmed officers were called to the residence and shot the dog after the pepper spray and taser were ineffective.

A spokesperson said the delivery driver entered the home to get away from the dog.

Police will allege an officer was also attacked by the dog, and used a gun as a last resort.

"The police officer was protecting himself apparently, I just felt it was excessive force used," Ms Chaplin said.

"Where he was shot was one metre inside our gate."

Ms Chaplin says the dog is a loving pet to her children. ( Supplied: Bonnie Chaplin )

Ms Chaplin said Chaos, who would undergo surgery to amputate his leg on Tuesday, was a loving dog to her children.

"My 18-month-old lays on him, rolls around with him and shares his food with him," she said.

"I didn't sleep a wink last night, my seven-year-old was up vomiting … he is actually worried the dogs aren't here to protect us.

"Chaos was in the vet last night to be treated for shock, and he's going to have his leg amputated today."

In a statement, Fastway Couriers said their driver suffered bites to his arms and legs requiring stitches, and would be off work for the rest of the week.

"We are pleased to confirm that our courier is now at home recovering, having been released from hospital following treatment for injuries to his arms and legs," a spokesperson said.

"This has obviously been a traumatic experience for him and the authorities involved in bringing the situation under control."

Bundaberg Regional Council's Animal Management team is investigating the attack, and has seized a second dog named Rusty from the Redridge home.

Ms Chaplin claims she came home to find Rusty gone, despite him not being involved in the attack.