you could also try to desensitise her , the world passing by outside to dogs can be quite un nerving so the whole getting in to the car isnt a problem, its when its moving ???? try covering the crate with a big blanket so that she cant see outside this way it should make the whole thing more pleasurable , she may just be panicing and soiling her self as a result of watching outside wizz by scary to a lil doggy lol .
Andrea

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