A DAD accused of murdering his 11-month-old son blamed the fatal injuries on the family dog.
Little Kadan Beaumont died in hospital from head injuries.
Sheffield Crown Court was told Michael Beaumont, 29, sent a photo of his son's injuries to Helen Barnes, Kadan's mum, while she was at work.
A message with the picture read: "Look at my head mummy. Naughty Mia knocked me down the steps in the garden. I cut my neck as well."
Beaumont told the same story to friends and paramedics who were called to the house when Kadan collapsed the following day.
Robert Smith QC, prosecuting, said: "He told them Kadan had been knocked down the steps by the dogs the day before."
The tot was found to have two recent fractures of the skull, bleeding in his eyes and on the surface of the brain as well as multiple bruises to his head and face.
He died at Sheffield Chidlren's Hospital on September 28, 2011.
Mr Smith said expert evidence would show that Kadan had been subjected to violence from when he was two months old.
"The cause of his collapse that morning was not due to any incident involving being knocked over by a dog.
"His collapse and death was due to trauma to the brain caused by someone striking or throwing him against some surface shortly before the emergency services were called."
Beaumont and Barnes, 28, a teaching assistant, were living at Chapel Street, Hoyland Common. He was caring for Kadan while Barnes was at work.
The prosecution say Barnes, who has a degree in early child studies, failed to seek medical attention for Kadan.
Kadan was taken to his GP on December 10, 2010 when he was seven weeks old after coughing up blood.
A week later he was taken to hospital with a 'cauliflower' ear which a doctor thought may have been caused by a punch. The medic said 'there was a high index of suspicion' of non-accidental injury.
Witnesses who saw Kadan covered in bruises in the street with Beaumont the day before his death were shocked at the youngster's appearance and one said the tot had a 'blank' expression.
Mr Smith said: "No responsible parent would have ignored those injuries."
Beaumont denies murder and causing or allowing the death of a child while Barnes denies allowing the death of a child and cruelty to a person under 16.
The trial continues.