Wiltshire Police would like to speak to the owners of the dog after the incident took place at around 12:30pm on Sunday 6th April in Churchill Gardens.
A 28-year-old local woman, her five-year-old daughter and four-year-old son were walking their Chihuahua dog on its lead. A tan and white Staffordshire Bull Terrier wearing a harness approached them and attacked the Chihuahua. The Staffordshire Bull Terrier knocked the boy to the floor, causing him a minor head injury as he hit the concrete and bruising his torso.
The owners of the Staffordshire Bull Terrier, a man and a woman, appeared to call the dog away without exchanging any details. They left the park through the underpass to Greyfriars Close.
The man is described as white, aged in his late 20s or early 30s, of slim build, five foot eight in height, with short brown hair. He was wearing a white t-shirt with a logo on the front and jogging bottoms.
The woman is described as white, aged in her late 20s or early 30s, of slim build and around five foot six inches tall. Her blonde hair was tied up in a bun. She was wearing a vivid blue sports jacket and jeans.
Witnesses or anyone with information which can identify the dog owners should contact PC Mike Parrott at Salisbury Police Station by calling 101.