I only left my pup in the car by herself once. She cried and barked, but she wasn't too crazy. I am worried about her tearing up my car, so I don't take her places when she can't go in with me. I would say to take things slow.
Sit in the car with the doors closed with him.
Then get out and stand by the car with the windows down. Calm him if you need to. Treat him for sitting nicely and not crying.
Then start closing the door and taking a couple of steps away.
You should be able to work up to leaving him in the car by himself.
Stormageddon (Stormie) GSD 11/9/13
Rio Husky/Shepherd Mix 8/1/00-7/15/13
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