Animals that are submitted for rabies testing are required to be euthanized first.
The woman, who has not been identified, took the raccoon to a Petco in the town of Auburn around 1:30 p.m. on Tuesday where "many different people handled the raccoon and some even kissed it," authorities said.
The store manager was ultimately alerted to the presence of the raccoon and asked the woman to leave the store before contacting the Maine Warden Service and the Maine Center for Disease Control & Prevention.
"It is illegal to possess wildlife in Maine, and Petco does not trim raccoon nails," authorities said.
Raccoons are one of the most common carriers of rabies, a disease that can be lethal unless quickly treated.