I'm worried that he may have pancreatitis
; which can be very serious.
Here's how I work up a case of vomiting;
Vomiting can be caused by a number of things....... the two main categories are what we call
1. metabolic reasons; for example, kidney disease, pancreatitis, liver disease, etc.
2. gastrointestinal reasons; for example an obstruction of the bowel, irritation of the stomach
lining, infection in the gut, etc.
If the problem isn't apparent after my physical exam, the first thing that I recommend is a fecal test to look for infectious diseases like the parasite Giardia which can cause vomiting. I especially recommend this right away if there is diarrhea too.
I usually recommend doing some blood work to look for the metabolic things that can cause vomiting. If your pet is acting sick and vomiting, it is more likely a metabolic reason. ( but not always)
If the blood work is unremarkable, then we talk about doing either X rays if I am suspicious of an obstruction, or an ultrasound if I'm worried about an inflammatory condition or a tumor.
With all this information, we can make a good assessment of the severity of the condition and make a plan for treatment.
It's also possible that it is just an upset stomach
or gastritis. That might improve with 24 hours of no food plus Pepcid AC 10 mg twice a day. Then only a bland diet
for a few days.... But if this is pancreatitis or an obstruction in the gut, then you will need veterinary assistance.
I have to recommend a veterinary exam of the vomiting continues into tomorrow. I hope that this helps you make a decision.
If I can help you further, let me know!