Pit bull attack victim loses left arm August 15, 2011 at 5:32 PM CDT - Updated June 25 at 2:36 AM TUCSON, AZ (KOLD) - The Tucson man who was mauled by his pit bull earlier this month had his left arm amputated Friday. Toni Sweet, sister of 61-year-old Michael Cook, said her brother's doctors will decide Monday whether to amputate his right arm as well. Cook has been suffering from liver failure and has been on kidney dialysis. His condition is critical. "He will need extensive rehabilitation," Sweet told KOLD News 13 in a telephone interview from San Diego. Cook, who is a musician and handyman, needed more than 100 pints of blood during the ordeal. His bleeding has stopped, she said. The incident occurred near Valencia and Camino de la Tierra on Aug. 3. The pit-bull mix that attacked Cook was quarantined at Pima Animal Care Center. Sweet said she was unsure whether the dog, named Butch, has been destroyed. "That's the last thing on my mind," Sweet said. Because Cook has been hospitalized at University Medical Center since the attack, Sweet said his two children, 16 and 21, "have been devastated." She said her family planned to speak with area banks Monday about setting up a assistance fund for Cook and his children. Copyright 2011 KOLD. All rights reserved.