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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
The ususal dose of novox is 2mg/lb so a full dose for a dog of her size would be 26mg. If she has eaten half a 75mg tablet she will have received a dose of ~37.5mg, so approximately 1.5 times the recommended dose. I would not expect to see severe toxic signs at this level, however you may see signs of mild gastro-enteritis (vomiting and diarrhea). These signs should be self limiting and should pass within 48 hours. If you see these signs, then feeding a light diet for the next few days - plain boiled chicken and rice, a little scrambled egg, plain white fish or light cottage cheese, can help take the strain off an irritated stomach and help things settle down. Giving ranitidine (zantac) 2-3 times daily as an antacid approximately 1 hour before meals can help things settle down too. It should be available over the counter at most pharmacies. For a 13lb dog I would recommend a dose of ~10mg 2-3 times daily. You should be seeing an improvement over the next few days. At that point, you can start to re-introduce her normal food.
If at any stage you see blood in her vomit, or blackened stools, this can be an indicator of a gastric bleed and she should be seen by your vet ASAP.