Original Article Dec 29, 3:12 AM EST Elderly man suing county, deputy over dog attack TUCSON, Ariz. (AP) -- An 83-year-old man who lost part of an arm after being attacked by a retired Sheriff's Department patrol dog is suing Pima County and the deputy who owned the animal. Alexander L. Dufour filed the lawsuit in Pima County Superior Court. Dufour claims the dog attacked him on April 19 while he was trimming trees in his backyard. He underwent surgery and had his right arm amputated at the elbow. The animal was later euthanized at the request of his owner, Deputy John Summey. Dufour's suit claims that the Sheriff's Department knew in early 1998 that Bronco wouldn't stop biting and that he had bitten three people while on duty and another person off duty. The suit does not specify damages, but a claim Dufour filed in May asked for $3 million. The claim, which is required before lawsuits are filed, said the damages requested are similar to the $2.5 million award the state paid to a teenager attacked by a bear on Mount Lemmon in 1996. The Sheriff's Department and Summey have not filed responses to the lawsuit.