what type of morphine is used for pets
Overview of Morphine for Dogs and Cats. 1  Morphine Sulfate, commonly known just as morphine, is a well-known drug sometimes used for dogs and cats to alleviate pain. 2  It is derived from the opium plant, which contains a naturally occurring substance found to relieve pain. Morphine should not be used in animals with known hypersensitivity or allergy to the drug. 2  Morphine should be avoided in animals with liver disease, kidney disease, underactive thyroid gland, hyperactivity or Addison's disease. 3  In very young, older and severely debilitated animals, morphine should be used with caution.