If you have lost your dog, cat or any animal companion, please visit the following websites which offer free and very often successful services where you can post up pictures and adverts for lost cats and dogs.
From our experience we also offer the following tips;
Dogs are the most likely of companions to get lost; we recommend you supervise dogs whilst in the garden and regularly ensure the garden is secure from escape, or even worse intrusion from dog-nappers; Bull Terrier types around London and the South East are especially at risk. Dogs also get lost while off the lead, reinforce your recall command whenever you can with your canine companion!
Cats rarely get lost and are more likely to get locked in a garage, shed or empty property by mistake. Always ask your neighbours if they can check their outbuildings as the first course of action.
Also remember if you have pet insurance for dogs or cats you can usually claim several hundred pounds to help with the costs of making posters or running newspaper adverts to find your missing friend.