It could be a number of reasons. If it persists, make sure you bring your pet to a vet. It's better when they can find an underlying cause early.
Have you been feeding it anything it shouldn't be eating? dogs shouldn't eat fruits or vegetables. if they refuse to eat something, don't make them eat it. your dog may have a bad pancreus.
Because it doesn't belong in them.
Your dog is very sick; take him or her to the vet ASAP.
This dog sounds sick. Please take this dog to a vet.
He may be sick. You should call your vet for advice.
5 min.
Uhh... yeah I would take your dog to the vet...
If your dog has been throwing up and has had diarhea for a few days, you need to contact your vet immediately, or get the dog to a vet immediately.
Call your vet for advice.
No. If your dog is throwing up worms, then you need to take it to a vet ASAP.
i would take your dog to the vet, just incase somethink is wrong with him/her.
You need to at least call a veterinarian and ask them if they think your dog needs to be seen by them.
WikiAnswers cannot makes such a diagnosis. Take it to a vet.