One of the dogs rescued after a house fire in Bowie last week has died, the Prince George’s County fire department said.

Otis, the more seriously injured of the two Chihuahuas, died overnight, said Mark E. Brady, the spokeseman for the department.

The dogs were found in a house on Sandal Lane, where a fire broke out on Wednesday, Brady said.

He said that when found, Otis, 2 years old, appeared to be near death.

Vigorous efforts were made to save both dogs, Brady said. On Wednesday, firefighters revived both with special oxygen masks designed for pets, he said.

The dogs were returned to the family that owned them, but the family had limited financial resources, Brady said. He said the dogs required treatment again on Thursday and firefighters again used oxygen masks.

He said Sunday that the second dog, Mylo, who is 3 years old, has been returned to his family after spending two days under veterinary care.

A man was arrested on arson charges in connection with the fire, Brady said.