The 'Lost and Found Pets' search service on mos.ru is a centralized service for finding lost pets. It works as an advertisement board and forms a register of all lost and found cats and dogs in Moscow.

A person who has lost an animal can place an advertisement, add photos of the pet, indicate the chip number, describe in detail the appearance of the animal, write the date and place when and where the pet was lost and leave contact information.

When residents find a lost dog or cat, they can check the ads in the service to find the owners and contact them. Users can use filters, such as animal breed, color, age, etc. Users can also search by the number of the chip, the date and address when and where the animal was found or lost.

If the people who have found a pet do not find an advertisement about the loss of this particular animal in the system, they can place a new ad about the discovered pet.