not an expert, but this worked for me
have you tried walking your dog or playing some you-want-the-ball-you-wannit-huh-do-ya-yeah-go-git-it-go-git-the-ball (sit-stay-fetch) before you get in the car? the fetching part is the treat, and a little "gooood girl." it's positive reinforcement for following commands. it'll subdue the prey drive, defensive aggression, or other inappropriate behavior she exhibits towards anything, including vehicles. i like using the ball/toy, or a stroke/pet and a verbal praise as the reward rather than food. fat dogs are ridiculous. i think that's just as bad as people who have cats that way 30 lbs. anyway.
you could get a diesel running and parked around a corner out of sight. you could start around the corner and walk her by it several times with a taut-leashed verbal admonishment. maybe a nudge or a tap, too. does she display aggression at parked trucks?
i'd start with the sit-stay-giddit game, first. it's way more fun, and shorter. i usually play fetch with my aussie shepard twice a day. it's a nice break, plus, she used to be a cantankerous little bitch.
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