This Schnauzer was vomiting without us finding out the cause. Ultrasound, barium meal tests showed nothing. Yet at 7.35 pm today, he passed out 3 "pebbles" after giving enema (constipation). To me it looked like durian seeds. Will check again.
In this case, I had advised exploratory laparotomy but the owner was not in favour of this. In this surgery, I opened up and would have seen the seeds.