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Is the dog up to date on vaccines?
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Thanks for the additional information. I really appreciate it.
I'm not worried about the match stick, but I am worried about the possibility of onion toxicity from the soup.
Onions can be very toxic to dogs, and because it's based on sensitivity, one dog may not get sick at all from it, but others may get violently ill and it takes a couple days for the signs to show up.
You can read more about onion toxicity here: http://www.petinsurance.com/healthzone/pet-articles/pet-health-toxins/Pets-and-Onions.aspx
At this point, there's nothing that your son can do at home to treat her. The absolute best thing for him to do is to have Sky seen by an emergency vet. If he's not sure where one is, he can go here: http://www.vetlocator.com and plug in his zip code and they'll point him in the direction of the one nearest to him.
At the emergency vet, they'll get some blood work done on Sky to make sure that her kidneys aren't being affected, and will get her on some fluids to flush her system and give her some medications to get the vomiting and diarrhea to stop.
I hope she does well.