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My name is***** and I am so sorry to hear that your dog is so sick.
Has your veterinarian offered an abdominal ultrasound? These can be very helpful to look for a blockage of the intestines that could be causing the nausea. Things that can cause chronic vomiting like this include a blockage by a foreign body like a stick, plastic, a rock, etc, blockage from a tumor in the stomach or intestines, pancreatitis, liver disease and others.I would continue to offer small amounts of very soft foods. You can puree them into a milk-shake consistency and he may be able to keep that down better.
Does this help? What other questions do you have?
I am so sorry to hear about your pup. My thoughts are with you and I am sending cyber-hugs,