"There's been another attack and the boy that was attacked looks exactly like Dallas," she said. "Like if I saw him in the street I would have thought he was Dal -- the same hair colour, the same hair length, it's really freaky."
Mrs Boyd said the attack was a major setback for her son who has now lost confidence to go out in public by himself.
"With autism, everyone is different, but for Dallas it's taken 10 years to get him to the point where he can go into town by himself," Mrs Boyd said. "Now he's very nervous about it you know, scared that it will happen again. I mean I can see him shaking now.
"Dallas was really upset, confused, and in shock because he didn't know what was going on, and he's now frightened to come into town by himself. It's hard."
She said the whereabouts of the attacker was still unknown and asked anyone with information to contact police.
"It's really important that people don't react angrily about it, but if they have information they should go to police about it. That's all I want," she said.
"I want this person to know what affect he has had on Dal, and to be accountable for it."