If you find a strayed animal, it's important to safely assess the temperament, before approaching. If you judge it safe to approach, try to secure the animal-use a lead or make-shift lead, for dogs, If the stray is a dog or cat, see if they're wearing a collar and identity tag. If not, take them to the nearest Veterinary centre, who will scan them for a microchip.
If you are unable to approach the animal, you must call the police, if the animal is causing any danger for traffic, and you can contact the local Dog Warden.
Reigate And Banstead dog warden: (01737) 276 605
See the post, regarding Local Vets, for their contact details.