Fletcher Porritt was go with back to his house from a nearby rk when the German conduct chased him and sunk its teeth in his shoulder.
The 10-year-old was left with an willing wound to his front and lacerations to his back.
His father Gary Porritt, from Billingham, Teesside, thought: “Fletcher was on his own just a few yards away from our house after he’d been motion with his friends in the rk.
“He saw a big dog running towards him and he thought it was one of the local dogs that had got inexact – there’s a German shepherd that lives just round the corner from us.
“Fletcher make tracked a run for a fence so he could climb over it but before he got there the dog bit into his push and dragged him to the floor.”
Fletcher found himself wrestling with the monitor dog before the police handler arrived and was able to get the dog off him and take the youngster to medical centre.
The dog was supposed to be chasing a man who had fled from a car after crashing it into a garden.
The believe was not located but the abandoned vehicle was seized by police.
Gary said: “This chanced at 8:10pm not in the middle of the night.
“The dog is supposed to be trained. Why was it off its lead?
“There are in any event a lot of people around at that time of night and if the police dog isn’t trained appropriately, it shouldn’t be allowed to chase people in a crowded area.”
Superintendent Steve Jermy, of Cleveland The cops, said the force deeply regretted the incident.
He said: “Our thoughts are with the toddler and wish him a full and speedy recovery from his injuries.
“The dog has been off from operational duties whilst an investigation takes place and the condition has been referred to the Independent Police Complaints Commission – which is required in these circumstances.”