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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
I have a few other questions for you.
Is there anything he could have eaten that could get stuck in his intestine?
Can you check his gum color for me- is it pink, pale, blue, yellow?
Is he having any diarrhea?
2 days of vomiting and not eating is going to make him quite dehydrated. My main worry would be a foreign body obstruction in his intestine. It could be something else- organ disease, infection, inflammatory disease, cancer- but foreign body would be my main concern.
We typically shoot x-rays to rule out an obstruction and run bloodwork to rule out pancreatitis and organ disease. If you can get to a 24 hour vet to start diagnostics/ treatment tonight, that would be ideal.
If you can't, then you could give an over the counter antacid like Pepcid (Famotidine) tonight. You can give him 20 mg every 12 hours. I would also try to get some water or Pedialyte or Gatorade into him- 1-2 ounces every couple hours. This will help with his hydration.
Sorry, I was typing when you just responded.
Those are a couple things you can do at home to help. Ultimately, though, it sounds like he's pretty bad if he won't stand. My guess is that he'll need to be hospitalized on IV fluids if he doesn't need surgery for an obstruction.
Best of luck, let me know if you have any other questions.
I think that's the best option. I hope everything goes well for him.