I am sorry to hear about Roxy's pancreatic attack. I assume it is 'acute'. I think that either white or yellow frothy vomitting can be present for either acute or chronic pancreatitis. My girl, an aussie mix, has chronic. Usually her vomit is yellow, but on occasion when she is really bad, it has come out white and very frothy, even mucousy at times. Some dogs can recover from an acute attack and never have another one again, other dogs do have repeat episodes. The acute attacks can be quite difficult to come thru, from what I have read.
I am guessing the vet has Roxy on a low fat bland homecooked diet for now (not kibble)? Just wondering if he is going to prescribe antibiotics, and/or anything for nausea? I am not an expert at getting thru an acute attack, so I don't know a whole lot about this stage.
Any clue as to what set off the attack? I think some culprits may be a sudden fatty meal, and I think an infection might can also set it off. I think my girls chronic came from SIBO - small intestinal bacterial overgrowth. SIBO was confirmed by testing. There is only one treatment for SIBO. BUT, I don't know if having SIBO would set off an acute attack. IT might be worth looking into, tho, since normal antibitoics are not useful against this. IF you decide to read mroe about SIBO, then TAMU might be a good place to start -- Texas A&M University.
I know there are a few other things that might precipitate an attack, but I can't recall them at the moment. Has there been any previous signs of vomitting or other problems before the last two weeks? Has the vet given any kind of outline about what to do the next few weeks? Is Roxy doing any better at all?