When people find a positive test result on the “blood” parameter with ThePetCheckup it is often due to some type of infection. Any positive result on the blood parameter should be followed up.
There are many reasons for blood appearing positive on the urine test, but they are not always from serious causes. It may be as simple as something rough (perhaps a piece of a stick) that your dog ate or a very tough blade of grass that your cat chewed on. This can irritate the digestive track, but is a temporary situation and should heal right up. If no other symptoms are noticed, the amount of blood is minimal, you can just retest in a day or so and see if it has cleared up.