Veterinarians found a mammary gland tumor in the female bear in July 2010 and treated her with low-dose chemotherapy and surgeries. Her condition, however, continued to deteriorate.
“I was impressed with the quality of life she had because of the hard work of the zookeepers who administered that treatment every day for three years,” veterinarian Dr. Allison Case said.
Black bears in the wild typically live 20 years.
She was one of two black bears at Northwest Trek, which both arrived in 1993 as orphaned cubs from Michigan. The surviving black bear is a 22-year-old male.
The wildlife park also has two grizzly bears.