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First, the Salmonella in the Iams dog food can affect humans, either by getting it on your hands while handling the dog food or by handling the feces of the dog.
Salmonella typically causes diarrhea, along with abdominal pain and cramping, so the absence of diarrhea is atypical. It is possible that there could be cramping before the onset of the diarrhea, but it is an atypical presentation.
The symptoms are more often seen with a viral
infection of the gut, called a viral gastroenteritis. A viral gastroenteritis also can cause diarrhea, but it is more common for it to present with cramping and abdominal pain without diarrhea.
A viral infection is usually managed with symptomatic relief, as the problem will resolve spontaneously. It also may help to use a probiotic, such as yogurt with an active culture or a probiotic supplement, which will promote the restoration of healthy germs in the gut. It is also OK to use acetaminophen for the pain. It is also appropriate to be drinking plenty of fluids to maintain hydration. There are some medicines to relieve cramping, but these medicines are only available by prescription. An over the counter antihistamine
also may ease symptoms, although not as good as the prescription medicines.
If you have any further questions, please let me know.