Six pets were rescued after someone set fire to the North Branch Veterinary Hospital early Sunday morning.
Police say five dogs and a cat were saved by firefighters, with no injuries reported.
The state fire marshal confirms the fire was a case of arson. A reward of up to $2,500 has been offered for information leading to an arrest.
Anyone with information is asked to call North Branch police at 651-674-8848 or the Arson Hotline at 1-800-723-2020.