Harrison's agent, William Parise, says 2-year-old James Harrison III was released late Tuesday afternoon. He says the boy is doing fine and that his father is missing practice Wednesday to be with the boy.
The boy was bitten on the thigh after his mother let the dog out of its pen Thursday afternoon. Also hurt were the woman and the player's massage therapist, who needed three stitches.
Parise says he's trying to find a place for the dog so it doesn't have to be euthanized.
"[Harrison] would love to find a home for him, but only if it was a home that would provide maximum security," Parise said, according to the Pittsburgh Post-Gazette. "This decision is not being made lightly, and it would have to be in the best interest of the welfare of the animal as well as of people."
Harrison has said the dog, named Patron, will have to be put down after a 10-day quarantine. But there are organizations that might take the dog and prevent it from being euthanized, and Harrison is considering those options, Parise said, according to the report.
"I'm a dog lover, and I don't know what I'd do if I lost [my dog]," Parise said, according to the Post-Gazette. "James was that close with Patron. One of the things James and I talked about was that this was a real tragedy -- the injury to his baby, and the baby's mother, and the loss of the dog. It's hard."
Parise said Harrison's dog had never bitten before, according to the report. But it can be very difficult to find shelters that will take a dog that has bitten people.
Best Friends, the organization that took in pit bulls formerly owned by Michael Vick, said it has little room to take in another dog, according to the report.
"Some dogs can be rehabilitated with training," Ledy VanKavage, a legislative analyst for Best Friends, said according to the report. "But so many healthy dogs are being put down. If we had room, we would [take dogs that bite people], but we're pretty full. Unfortunately there aren't enough sanctuaries out there."
Information from The Associated Press was used in this report.