 And I'm Erwin Gratz, Maine Public Radio News. Maine shelter and pet owners are raising concerns about new federal regulations for dogs crossing the border into the U.S. Beginning August 1st, dogs must be at least six months old, have a microchip, and documentation of a rabies vaccine. Betsy Hallett runs the Central Aristic Humane Society in Presque Isle. She says the new rules will make it more difficult to rescue some dogs, facilitate adoptions, or return some lost pets to their owners.