16. Bloody Diarrhea. Blood in the feces can either appear as "melena" which makes the stools appear black and tarry is the presence suggests digested blood in the feces. Melena is different from fresh blood in the stool (hematochezia). Bleeding into the colon or rectum appears as fresh blood in the stool. Bloody diarrhea should be evaluated by your veterinarian as soon as possible. Click here to learn more.

17. Bloody Urine. Hematuria is the presence of red blood cells in the urine. It may be gross (visible to the naked eye) or microscopic. There are several possible causes including bacterial infections, cancer, stones in the urinary tract. Click here to learn more.

18. Bite Wounds. Bite wounds are often the result when two animals engage in a fight or aggressive play. Bite wounds, which may only appear as a small puncture wound in the skin, can actually be quite extensive. Once the tooth penetrates the skin, severe damage can occur to the underlying tissues without major skin damage. Some wounds may appear deceptively minor but may have the potential to be life threatening, depending on the area of the body bitten. All bite wounds should receive veterinary attention. Click here to learn more.

19. Bloody Vomit. Vomiting blood can fresh blood, which is bright red or partially digested blood, which has the appearance of brown coffee grounds. There are a variety of causes of vomiting blood and the effects on the animal are also variable. Some are subtle and minor ailments, while others are severe or life threatening. Click here to learn more.

20. Lethargy or Weakness. Lethargy is a state of drowsiness, inactivity, or indifference in which there are delayed responses to external stimuli such as auditory (sound), visual (sight), or tactile (touch) stimuli. Lethargy is a nonspecific sign associated with many possible underlying systemic disorders. It may have little to no impact on the affected individual; however its presence may represent severe or life-threatening illness. Lethargy of more than a day's duration should not be ignored, and should be addressed, especially if it persists. Click here to learn more.

21. Pale Gums. Pale gums or mucous membranes can indicate blood loss or "shock". The possible causes for either blood loss or shock are life-threatening and thus should be evaluated immediately. Click here to learn more.