@JeremyECrawford does an animal companion continue to attack it's target after given the attack command?
— Jeff (@jeffvmahar) June 23, 2015
As written, the ranger's beast does not. Some DMs do allow it to repeat the last command it was given. https://t.co/5MAkda2Rld
— Jeremy Crawford (@JeremyECrawford) June 24, 2015