The worst tragedy is to loose your dearest family member your “PET”. When you find that your pet is missing you would like to turn all stones possible in search of him. I can suggest you few ways to retrieve your friend back. Firstly, do not let your mind conclude negative things till you have done everything in your hand to search.
Start your search by inquiring with your neighbors, if anyone has seen him roaming around that will be a great help. If your neighborhood is of no help then prepare posters of your missing pet add a description and a photograph to it. Try to describe your pet in detail emphasizing more on the appearance by mentioning anything that will separate him from other pets, like if he is missing any part of the body or about the color of patches he has or any other thing that will make people to recognize him as soon as they set eyes on him.
Do not forget to provide your contact information on it in a hurry, otherwise after finding your pet people would have no idea how to contact you. Also mention your area code so that people staying nearby pay more attention as it is common to find the pet around your area. Then the next thing you have to do is start distributing it and pasting it everywhere. Select your spots carefully which is visible to most of the people, try to select a spot where people mostly gather like near a food cart or a newspaper stand where people stop by.
Ensure that you paste it in your complete area and also in the areas around you. Your job is not over after this you should keep the search on till the time it is day try to check out empty and deserted lanes. It is quite possible that he left the house following some other pet and could not find way back and could be cuddling in some corner waiting for you to come and pick him up.