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You should try crushing the pill and then mixing it in with a liquid and syringing it into her mouth. This works well. Many dogs are smarter than us humans and they won't let us jab the pill down their throat.
You should start to see some improvement after 48 hours on the antibiotic.
The antibiotic can cause stomach upset but the problems that you are seeing are probably from the infection that the antibiotics are treating.
It's very important that you get the antibiotic into her.
Let me know if you still have questions.