A young girl was attacked and bitten by a dog while on the beach opposite Les Grandes Maisons Road.
The dog is believed to have been a Border Collie type.
Its owner is described as a white woman in her early 40s. She had brown hair, spoke with a French accent and was wearing a pink jumper at the time.
Officers are wanting to speak to anyone who witnesses the attack, which happened on Saturday 5 June.
An appeal has just been issued.
Anyone with information are asked to contact Guernsey Police or Crimestoppers anonymously on 0800 555 111.
Guernsey to consider social media ban for under-16s
Guernsey footballer shares pics from England squad visit
Guernsey endurance athlete on schedule for record breaking walk
First stage of Guernsey's Castle Bridge reconstruction begins
Guernsey cyclist becomes MBE in King's Birthday Honours
Guernsey students heading to university to receive Meningitis B vaccine
Guernsey teen set for month-long marathon swim
Guernsey Post introduces new services from early July
