Leighton Jones is with the American Red Cross of Massachusetts. He said the law will help protect people as well as animals:
"People won’t evacuate their homes if they aren’t able to take their pets with them. Many people, myself included, consider their pet as a member of a family," he said.
Pets aren't allowed in Red Cross shelters, but many towns will set up a pet shelter next door to the Red Cross shelter, Jones said.
"We often will partner with a partner agency to set up a pet shelter immediately next to the Red Cross shelter.
Rob Halpin, of the MSPCA Angell Animal Hospital, said prior to the law, animals could just be left behind in a storm.
"As we've seen with Hurricane Sandy and with previous hurricanes in the US, many pets are never reunited with their owners," Halpin said.
Cities and towns have a year to come up with the new emergency plans.