Just posting this on here in case anyone else comes across this specific issue with their dog. We have a 6 month old puppy who had been vomiting up nothing but watery yellowish watery/bubbly stuff almost every single night for over a month. No other symptoms- perfectly healthy and eating/acting normal outside of this. It's been really frustrating as we just spent well over $1000 in vet bills curing her of diarrhea, only to find this vomiting start after we cured that. The vomiting was only happening overnight, and by morning she'd stepped all over it and the whole house stunk of this vomit.
I'm pregnant and super sensitive to smell right now, so was really at my wits end. Anyhow, my husband finally ran across something online that talked about some dogs vomiting up bile overnight due to being hungry . So the cure is simply to feed the dog a little bit right before you head to bed. We had been feeding her the recommended 3 cups of food per day for her weight, but just twice a day, 1& 1/2 cups in the morning and in the evening around 5-6pm. With this tip we have been topping her off an extra 1/2 cup (on top of the three cups) right before we head to bed and WOW, vomiting has completely stopped. So glad my husband ran into this advice and wanted to be sure to share out for others who might run into this issue!