A pet blood tester includes a reader configured to read identification information of a pet from a tag; an analyzer configured to analyze blood of the pet to acquire information on the blood; a storage; a controller configured to receive stored body information of the pet corresponding to the identification information from at least one of an external device and the storage if the stored body information of the pet corresponding to the identification information is stored in at least one of the external device and the storage; and an inputter configured to receive input body information of the pet from a user if the body information of the pet corresponding to the identification information is not stored in at least one of the external device and the storage, wherein the controller is further configured to provide a blood test result and diagnosis information for the pet, based on the information on the blood, and the stored body information of the pet or the input body information on the blood.
