This question is always found in pet forums - and to some degree, it makes sense to use human blood glucose monitors on your pets. Blood glucose levels are tested in similar ways for both humans and some animals, such as cats. But this doesn't mean that the same monitors used will deliver the same results. The reason why human blood glucose monitors and animal monitors differ is that the balance of glucose found in human bodies and animal bodies differs greatly. Glucose monitors need to be specifically calibrated for use with a cat or dog (even the animal species differ) or you will get inaccurate results.