SAN ANTONIO -

Arson investigators are working to determine the cause of fire that started early Saturday morning.

The blaze broke out about 6:30 a.m. at a home in the 9400 block of Celine.

Fire crews arrived to find heavy smoke and flames pouring from the single story house.

A dog was inside at the time but was able to make it out safely.

The damage is estimated at $50,000.