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  • This handout explains atopic dermatitis (atopy) in dogs, a form of allergic skin disease brought on by an abnormal response to allergens in the environment. The clinical signs, diagnosis, and treatment are outlined.

  • Atopivet® topical products are formulated to help maintain a healthy skin barrier and support skin health in cats and dogs. These skin care products are available over-the-counter in the forms of a mousse, spot-on, and skin-care collar.

  • Atovaquone (brand names: Mepron, Malanil, Wellvone) is a drug used to treat infections caused by protozoa (single-celled organisms that cause disease). It is often combined with other drugs to treat specific infections.

  • Atracurium is an injectable neuromuscular blocking agent used during general anesthesia to produce complete muscle relaxation during surgery or mechanical ventilation in cats, dogs, rabbits, rodents, and other animals. It may also be used when placing a breathing tube (endotracheal intubation) or used in the urethra to help manually express the bladder.

  • Atrial fibrillation describes rapid contractions or twitching of the heart muscle, specifically in the atria. In dogs, atrial fibrillation usually occurs secondary to heart disease. In some large breed dogs, atrial fibrillation occurs as a primary heart problem. Signs, treatment, and outlook are discussed.

  • Atrioventricular (AV) valve dysplasia is a developmental malformation of the mitral or tricuspid valve in the heart. Signs include exercise intolerance, accumulation of fluid in the abdomen, weight loss, and stunted growth. Difficulty breathing or collapse may occur if congestive heart failure develops. Treatment of AV valve dysplasia is focused on managing signs of congestive heart failure and/or disturbances in heart rhythm, generally using medications.

  • Atropine ophthalmic (brand name Isopto Atropine) is an eye medication used to enlarge the pupil. It is used off label (extra label) only, in all veterinary species of animals. Atropine ophthalmic comes in a drop, solution, or ointment form, which is placed directly into the eye.

  • Attapulgite (brand name Toxisorb™ Bolus) is an anti-diarrhea clay supplement used in pets like dogs, cats, horses, and cattle. It works by binding bacteria and toxins to help restore a healthy intestinal system.

  • An aural hematoma is a collection of blood between the cartilage and skin of the ear flap. It is most usually caused by trauma but can also be due to a bleeding disorder. Hematomas in dogs should be treated early to minimize pain and disfigurement.

  • Auranofin is a gold salt that is given orally to treat certain skin conditions and immune-mediated conditions in cats and dogs. It is used off label (extra label) in veterinary medicine. Auranofin comes in capsules to be given orally.