Lewis Barkley, 11, suffered horrific injuries when he and a friend, who cannot be named, were attacked in Speke, Liverpool, on June 24 this year.
Harrowing pictures of terrified Lewis, who suffered 17 bites requiring more than 300 stitches, were released by his family after his ordeal.
Fredrick Farnsworth, 73, of Stapleton Avenue, Speke, admitted two counts of being in charge of a dog which was dangerously out of control.
But the two Staffordshire Bull Terriers, which he claims he was walking for a man called Mark, have never been found.
Judge Gary Woodhall today said Farnsworth, a grandfather, showed "a complete lack of remorse" and told him:
Liverpool Crown Court heard Farnsworth denied perverting the course of justice by allegedly misleading police over the location of the dogs.
He was set to stand trial but prosecutors were forced to drop the charge after conceding there was not a realistic prospect of a conviction.
Farnsworth claimed he did not even know the names of the dogs - one black and one beige - owned by a man called Mark who is in jail.
Edmund Haygarth, prosecuting, said:
The two boys were playing football in a caged area, in a park off Stapleton Avenue, at around 5pm, when the beige dog ran over and jumped up. Witnesses Shane Oosthuizen and Megan Herbert, who were walking their three dogs, saw the children try to climb onto a raised area to escape.
Mr Haygarth said Lewis' friend was only bitten on his finger, but he was not so lucky, as the black dog joined the attack and they both savaged him. Farnsworth slowly ran over to intervene but it was heroic Mr Oosthuizen who dragged the dogs off Lewis, before other people came to help.
A policeman arrived and described Lewis "crying hysterically", shouting and screaming in "immense pain" and bleeding from his face and chest. He suffered 17 bites in total to his head, chest, back and legs, including four to the face.
Farnsworth said he took the dogs home and locked them in his garage before going back to the park, but when he returned with police, they had gone.
The OAP told officers he heard Lewis screaming "I think I'm going to die", but refused to name the two people he initially said owned the animals.
Mr Haygarth said:
The court heard the incident left Lewis scarred for life and both he and his friend psychologically damaged and requiring counselling.
Farnsworth had 12 previous convictions for 19 offences, the last in 1999, mostly for dishonesty and driving matters, but also assaults in the 1960s.He used two crutches in the dock, which Jeremy Rawson, defending, said was the result of a hip replacement in August, and also has arthritis.
Mr Rawson said:
He said Farnsworth had parental responsibility for his 16 year-old grandson, but if he was jailed, his wife would look after the boy.
Judge Woodhall said a man of Farnsworth's age and ill health was never going to be able to control the dogs and by the time he intervened it was "too little, too late".
The judge said Woodhall "had not heeded the earlier warning" when the dogs tore up the football and refused to help get them off the streets.
Judge Woodhall noted that in a pre-sentence report Farnsworth said he would rather spend time in prison than place his grandson at risk by naming the dogs' owner.
He said: "It seems you're in effect condoning what happened - putting other members of the public at risk of serious injury."
The judge ordered the destruction of the dogs - which he said the owner was hiding from the authorities - and banned Farnsworth from keeping dogs indefinitely.
Unrepentant Farnsworth showed no emotion as he was jailed for 18 months.