WASHINGTON—President Joe Biden and first lady Jill Biden’s dog Major will get professional help adjusting to the White House after a pair of biting incidents last month. Private training for the 3-year-old German shepherd will be “off-site” in the Washington area, Michael LaRosa, a spokesperson for Jill Biden, said Monday in an emailed statement. The training is expected to last a few weeks, he said. The Bidens also have a second German shepherd, 12-year-old Champ, at the White House. But it is the younger canine who has been the source of angst since both dogs were relocated to the White House in January from the Bidens’ home in Delaware. Last month, the White House confirmed that Major had nipped someone during a walk. Shortly before that incident, Major caused what the White House said was a minor injury to a Secret Service employee on March 8. Both dogs spent time …