All dogs in Boston require a new license every year from the city, and the deadline to get one for this year is March 31. There's been a significant increase in dog adoptions during the COVID pandemic, and the city wants to inform all dog owners that it's required to get a dog license every year. All dogs six months or older need to be licensed. The fine for unlicensed dogs is $50. “A license is your dog’s fastest ticket home if they become lost, and it’s the law,” said Animal Care and Control Director Alexis Trzcinski.