Police said the dog attack took place inside a townhouse in the 200 block of Hidden Creek Lane on Thursday afternoon.

Shards of glass at the townhouse were left behind after the terrifying and violent encounter left two people seriously injured and a dog with a gunshot wound.

“It was absolutely mind-boggling to me that he actually attacked a child with little or no provocation,” said the townhouse owner, who asked to remain anonymous.

She said her tenant in the Summer Wind subdivision in North Aurora is the owner of the dog, a 5-year-old purebred male pit bull named Maximus.

“He’s around me and my 5-year-old daughter every day,” she said. “He lives with us. He’s with my cats. No problem.”

She said her tenant’s friend brought her 6-year-old son home and they were filling water balloons around 4 p.m. when something triggered Maximus. The dog mauled the child, then turned on its owner when it tried to protect the boy.

“When the units arrived, they couldn’t get in,” North Aurora Police Chief David Fisher said. “So the firefighters broke down the door, and one of the officers came in, whereupon the dog charged at him and four shots were fired.”

“It didn’t kill him, surprisingly enough,” the home owner said. “The dog was, I believe, taken out of the house after that or removed alive from the house, obviously with the firm intention of euthanizing him at the vet’s office.”

The boy and man were first taken to Mercy Medical Center with multiple serious injuries. Their conditions, according to the police, have now stabilized.