Lennox was in the garden to protect Cameron and Oliver Tetlow
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An Oldham man whose dog was injured with a corrosive substance last month has increased a reward for information about the attack to £2,000.
Lennox, a five-year-old Doberman, was sprayed in his mouth and across his back and suffered internal and external burns.
Lennox's owner John Tetlow had offered a £500 reward, but on Thursday he said it would be increased to £2,000.
The attack happened after Mr Tetlow let his two sons Cameron, aged eight, and Oliver, 11, sleep in a tent in the garden of the house on Streetbridge in Royton on 1 August.
He thought his sons would be safe if he kept Lennox in the garden.
He heard Lennox barking as a group of about five or six people - including a girl - walked past the house early on 2 August.
At about 0900 BST Mr Tetlow found Lennox in a great deal of pain and discovered his injuries.
Lennox is making a steady recovery, despite his injuries
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Lennox was taken to the vets and it was discovered he had severe internal and external burns from the spray.
Despite extensive treatment, Lennox has suffered permanent damage, but had stitches removed last week.
Steady recovery
Mr Tetlow said: "Lennox is thankfully making a steady recovery, but it has been a long process.
"The whole family were devastated about what happened to Lennox, but the attack has also affected my friends and neighbours."
He said neighbours have helped raise the reward money.
Detective Constable Ian Thompson from Greater Manchester Police said: "This was a sickening attack on a dog that was protecting its family and we need to catch the people responsible.
"We have had a number of calls in connection with this incident, but the response from the public is not as good as we had hoped it would be."