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.

Donations flood in to save Sark-born border collie with rare condition
Aurigny extends flight schedule up until early January
Blue Islands' Guernsey debt remains undisclosed
St Peter Port Marina awarded four gold anchors
Islanders raise nearly £70,000 in 2025 Swimarathon
Ports of Jersey agreed to defer fees of £3.2M to help Blue Islands 'keep afloat'
Emergency accommodation for homeless arrives in Guernsey
Blue Islands goes into liquidation