British singer Emma Bunton has offered a reward as fans scour London looking for her missing dog.

The former Spice Girls star was walking her Labrador Retriever Phoebe in the city on Monday (04Feb13) when the prized pooch unexpectedly took off.

The 37 year old asked her followers to keep an eye out for the canine and report any sightings - and now desperate Bunton has upped her campaign to find the lost pet.

In a post on the microblogging site, she writes, "I still haven't found my beloved chocolate Labrador, please let me know any info, there will be a reward."