The first thing you need to do is to get a definitive diagnosis so you don't make her sicker by treating her for the wrong thing. The most common sign associated with salmonellosis, acute enteris, may also be caused by other bacterial, viral, or fungal agents, toxins, drugs, eating something irritatings, or parasites to name a few. If you pup has had diarrhea for a while, dehydration also can be a problem and intravenous fluids might be necessary. Whether or not to give anything for vomiting depends on the cause. Because of all this and your dog's young age, I suggest you have her examined by your veterinarian as soon as possible.
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