The 35-year-old man and 27-year-old women were arrested and bailed after the baby died in hospital.
He was rushed to hospital but died soon after.
The pair’s connection to the baby has not been disclosed, and no-one has been identified by police.
“It was a big fluffy golden thing. It didn’t look like a dangerous breed,” she said.
“But police were struggling to get it into the dog van.
“It was strong enough to be dragging three officers into the road.”