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  • The pupil is a round opening in the middle of the iris that allows light to pass through the eye to the retina. The pupil constricts or dilates (enlarges) according to the amount of light that enters the eyes, with both pupils normally dilating in dim light and constricting in bright light.

  • Anorexia (a loss of appetite) and lethargy (a feeling of listlessness and general inactivity) are commonly seen in sick pet birds. While not diagnostic for any specific disease, these signs can indicate severe illness in a bird that requires immediate medical attention. Birds rarely get sick overnight. Usually birds are ill before pet owners notice outward signs of illness.

  • Anorexia is a decrease or loss of appetite for food. While hunger is physiologically driven, appetite is psychologically driven. There are two types of anorexia: true anorexia and pseudo-anorexia.

  • Anorexia is a decrease or loss of appetite for food. While hunger is a physically driven, appetite is mentally driven. There are two types of anorexia: true anorexia and pseudo-anorexia. Both result in decreased food intake, but a dog with pseudo-anorexia wants to eat (is hungry) but can't because of difficulty picking up, chewing, or swallowing food or some other cause.

  • Antacids are used to neutralize excess acid (decrease the amount of acid) in the stomach. Antacids can be used for inflammation of the esophagus, excessive acid in the stomach, peptic ulcer and inflammation of the stomach. In patients with kidney failure, antacids may be used to decrease the amount of phosphate in the blood.

  • Different animals have different levels of susceptibility to anthrax infection. In general, herbivores are found to be more susceptible to anthrax than carnivores. Under normal circumstances, cases of anthrax in cats are very rare and cats seem relatively resistant to infection, especially under normal circumstances.

  • Unfortunately, anthrax has been threatened as a method of bio-terrorism and dogs can be infected, as can most mammals. Different animals have different levels of susceptibility to anthrax infection. Herbivores (animals that eat plants, such as cattle, sheep, and horses) are the most susceptible to anthrax.

  • Antibiotic resistant bacterial infections are bacterial infections that are minimally or no longer responsive to commonly used antibiotics. In other words, these bacteria are resistant to antibiotics - they cannot be killed and their growth cannot be stopped. Antibiotic resistant bacterial infections most commonly affect the skin, the gastrointestinal tract, the urinary tract, or the respiratory tract.

  • Antibiotic resistant bacterial infections are bacterial infections that are minimally or no longer responsive to commonly used antibiotics. In other words, these bacteria are resistant to antibiotics - they cannot be killed and their growth cannot be stopped. An infection that does not respond appropriately to an antibiotic is suggestive of an antibiotic resistant bacterial infection.

  • Antibodies are specialized proteins, also called immunoglobulins that are primarily found in the bloodstream. They are produced by specialized white blood cells called plasma cells, a form of lymphocyte.