Report lost or found pets to the following:
Lost Dog Registry web site has a searchable database for lost and found animals in the KC metro area (it's not just for dogs.)
KC Pet Project has an online form to fill out for lost pets.
Check Craig's List for lost and found pets.
Pet Harbor web site has a searchable database for lost and found animals. Some of the KC area municipal animal shelters post their pets on this site to try to reunite them with their owners
If you have lost your pet:
Always keep current ID on your pet with a phone number where you can be reached at all times.
Microchip your pet.