"I picked Rosie up and said to him, 'you've killed my dog'. He pointed his finger at me wanting to know why I didn't 'f****** look after my dog'.
"I asked him why, like other motorcyclists on the beach he didn't slow down. She [Rosie] was dying in my arms, with blood coming from her mouth. She was drowning from the blood forming in the back of her throat."
Local bylaws state dogs do not have to be on a lead in the area. The speed limit for vehicles on the beach is 20km/h.
Mrs Hamilton described the bike as "grey-black" in colour. "Everything about this bike and person was black, and dark, and ugly."
Rayner told the court he was only in third gear at the time of the accident and was driving no more than 15km/h. He estimated his stopping distance from the point of impact was about 15-20 metres.
He said the weight of his passengers in a trailer full of fishing gear made it impossible to travel fast.
"I couldn't have been travelling in 4th-gear as it just digs in."
He said speed was not an option as the bike had no mudguards, which would have pelted his two trailer passengers with gravel.
Judge Jonathan Down said the lengthy stopping distance wasn't commensurate with a vehicle travelling only 15km/h. He said he agreed with police who argued the dog's death was evidence enough that the bike was operated in a dangerous manner.
He ordered reparation of $2000 and disqualified Rayner from driving for six months.