NAPA (CBS SF) — Napa police issued a warning Monday to local pet owners about the dangers of leaving dogs inside vehicles during the current heat wave.

Authorities said a dog was spotted inside a parked car at the South Napa marketplace on Sunday while the temperature outside was soaring into the triple digits.

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They called 911 and Napa police and an officer from the sheriff’s department’s animal services division responded and freed the dog from the car.

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A check of the temperature inside the vehicle with a thermometer registered a stifling 136 degrees.

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The dog was taken to a local vet where it was under observation. The incident remained under investigation.