He is regularly given dog food and water, and the staff even managed to find a local kennels, 3km from the hospital, willing to take him in.
Workers from the kennels eventually showed up to take the dog away.
But with a new owner lined up to take him, hospital workers were shocked to see the dog turn up back to the hospital not long afterwards, having escaped the kennels.
The animal's story went viral on social media after a local woman, Cristine Sardella, shared photos of him to Facebook.
"We have a lot to learn from animals," her post on Facebook read.
"This dog stays every day at the door of the Santa Casa de novo horizonte hospital waiting for its owner who unfortunately passed away.
"He may be waiting in vain, but the love he feels for his owner is eternal."