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  • An anaphylactic reaction or anaphylaxis is an immediate hypersensitivity reaction to a foreign substance, especially a foreign protein. Any foreign substance can produce an anaphylactic reaction. Clinical signs are dependent on the route of exposure (mouth, skin, inhalation, injection, etc.), the amount of antigen and the level of the pet's IgE response. An anaphylactic reaction is a medical emergency and immediate treatment is required.

  • Anaplasmosis is a disease that affects dogs, but can also affect people. It rarely affects cats. Multiple species of ticks can transmit the disease. Diagnosis is relatively simple and treatment is effective.

  • Anemia is a medical term referring to a reduced number of circulating red blood cells (RBC's), hemoglobin (Hb), or both. It is not a specific disease but rather it is the result of some other disease process or condition.

  • Anemia is a medical term referring to a reduced number of circulating red blood cells, hemoglobin, or both. It is not a specific disease but rather is the result of some other disease process or condition.

  • The word anesthesia comes from the Greek meaning "lack of sensation". Anesthesia is accomplished by administering drugs that depress nerve function. With general anesthesia, the patient is made unconscious for a short period. During this unconscious state, there is muscular relaxation and a complete loss of pain sensation.

  • The word anesthesia comes from the Greek meaning "lack of sensation". Anesthesia is accomplished by administering drugs that depress nerve function. With general anesthesia, the patient is made unconscious for a short period. During this unconscious state, there is muscular relaxation and a complete loss of pain sensation.

  • In cats, the pupil is an elliptically-shaped 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.

  • 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.