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Hi this is Dr. Hill. Sorry Scruffy if sick. Give me a moment to thoroughly read your questions.
So, dogs eat grass because they are nauseous. Nausea can be due to a number of different problems: pancreatitis, gastroenteritis, foreign body ingestions, kidney and liver disease, gastric ulcers, etc. Let me ask a couple of questions to get a better feel for what is going on with Scruffy.
How long has she been eating grass? What is her normal diet? Does she get any high fat treats, like meat, cheese, marrow bones? Has she been spayed? Has she been dewormed in the last year? Lets start there.
Okay. So there are a number of possible reasons that Scruffy may be nauseous. Given that brief history I would be most concerned with pancreatitis or intestinal parasite. First parasites, dogs are exposed to parasites any time they are outdoors. If you have her on a monthly heart worm preventative then you she is also getting a dose of dewormer. Ideally she should have a fecal checked yearly to make sure that she does not have parasites.
Pancreatitis is inflammation of the pancreas in response to high fat intake. Some dogs could eat bacon and eggs every day and not have a problem, but pancreatitis can occur at any time. Pancreatitis is diagnosed by bloodwork, physical exam (focal pain on abdominal palpation) and clinical signs (vomitng, diarrhea and loss of appetite). Last, if since she has not been spayed, there is a chance of a uterine infection making her sick. This is called Pyometra. It can be open where you see discharge from the vulva or it can be closed where there is no discharge. This is diagnosed with bloodwork, physical exam and X-rays of abdomen. How often is Scruffy vomiting? Is she keeping any food down today?
So vomiting even a couple of times a month is a sign of illness. She may have pancreatitis, an allergy to her food or parasites. She really should be seen by your local veterinarian so that they can run some bloodwork to try and determine what is making her nauseous. She would benefit from a bland diet, antacids and anti nausea medication.