Have only just seen this.
I live on Epsom Downs so not far from either Worcester Park or Dorking. We own a shop and am happy to put up posters etc.
The owner must be frantic.
I know she must have tried every avenue but am just wondering about my local dog warden and as I foster I know the local kennels pretty well (one of the kennels is in Dorking!!)
If you want to pm and let me know I can put the feelers out.
Hope this helps.
Annette