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HI this is DRB and I would be happy to help you. First,there are many things that can cause diarrhea and vomiting especially in an older dog. You need to take your dog to your vet and have a CBC, chem panel, urinalysis and T4 done. Also should do a 4DX test. If all this is normal then you have at least ruled out metabolic disease and kidney issues. Then I would also recommend that you have some abdominal xrays done due to your dogs age to try and rule out at least any overt cancer. If these are normal then a food trial with a highly digestible diet like science diet prescription diet Intestinal diet would be appropriate. Your vet could also add some pepcid AC to this diet........if this does not improve your dog then an abdominal ultrasound should be done. I hope this helps you. Let me know if you need additional help.
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Then I would go for a food trial as I have designated above. Many dogs develop food intolerance and can only eat very highly digestible foods. Try the Science diet Prescription diet Intestinal diet. Your vet can get this food for you and likely already has it in stock. This usually works very well and will prevent GI intolerance.But remember if this does not work then you need to have the other diagnostics I have listed because vomiting is a non specific sign of a problem. I hope this helps but let me know if you need additional help.