ATTLEBORO, Mass. — A man, a woman and a dog were found dead Wednesday at a home on Andover Avenue, Attleboro police said. First responders were dispatched at about 11:30 a.m. after a 911 call. Police said they are investigating the deaths as unattended and that the Bristol County District Attorney’s Office was called to assist. Authorities had not released further details, including the identities of the people or the circumstances surrounding their deaths.