One of three male wolves at Lake Superior Zoo in Duluth, Minn., was euthanized Tuesday after an abdominal exploratory surgery uncovered a ruptured abdominal abscess. "This was one of the worst abdominal cases I've operated on in 25 years," said zoo veterinarian Louise Beyea, who added that the abscess was so large and invasive that removing it would have compromised blood supply to 30% of the wolf's large intestine and 75% of the small intestine. "The problem with wildlife is that they don't show symptoms of illness until they are extremely ill," Dr. Beyea said. "Even in pet dogs that show signs of illness right away, these are very challenging cases."
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