Lovely, the dog, died Sunday morning at the Pima Animal Care Center, after having been set on fire almost two weeks ago.
PACC said the dog went into cardiac arrest and despite the veterinarian's best efforts, they were unable to save her life.
Earlier this week, PACC employees said Lovely had about a 50 percent chance of surviving her injuries.
Dean Sherfield Finley of Tucson is accused of intentionally setting the dog on fire inside a home.
According to authorities, Finley purchased two gallons of gasoline on May 7 and returned home. A family member noticed the dog was "wet" and when the person went to pick the dog up, Finley lit the dog and a corner of the residence on fire.
The suspect was arrested for arson of an occupied structure, criminal damage and animal cruelty.
