I'm sorry to hear about you'r loss.

what breed is you'r dog?
I found with max that he had heartburn & that caused him to vomit. with him being about 170 we gave him Zantac (did I spell that right?), you might want to ask you'r vet about something like that.
also depending on the size of you'r dog. Like in big dogs sometimes they can't digest there food proberly, so elavateing it helps them digest it a little bit better.

But if I was you I'd call my vet.

good luck ~~