Your best allies will be your family, friends, and neighbors. Give them photographs and ask that they search specific areas. Try different times of day and night too. For instance, cats are usually more active at early morning or evening hours and tend to stay close. Your search may be better during those times.
Dogs tend to run farther and are more sporadic in their habits.
They are very diligent and can cover a whole lot of territory. They have an incredible network of friends, lots of energy and can cover a whole lot of ground quickly. Make sure you have a way of getting the animal and preventing escape again. With a leash, you can make a slip collar, by taking it and making a loop through the handle. You can then place it over the animal s head and pull it secure so the animal cannot escape again.