We always recommend to run a search using a photo, since it's the most accurate way of searching, but we understand there are instances where is a photo is not always available.
On the Petco Love Lost website, click on the orange I Lost a Pet link.
A pop up will appear. Enter the zip code of the area the pet went missing. Be sure to select one of options/suggestion generated by Google in order to receive the most accurate search results. Then click the purple Continue button.
Another pop up will appear. Select the purple Search All Pets button to search without a photo.
On the results page, scroll all the way to the bottom to also conduct a search by Microchip by clicking on the Search By Microchip ID button.