Long, Long ago a dog showed up on my doorstep doing the same thing...
The next morning she was still there but had company - 8 puppies!!
The only way to really know what's happening to your dog though is to take her to the vet. Obviously something is bothering her.
It could be any number of things causing those symptoms.
Labman is right too, call the vet tomorrow because the weekend rates will rob your bank account.
Good luck, let us know how it goes.
Kae
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