Hello, I am Dr. Zoe, a licensed veterinarian here to help. This does sound concerning for Peanut. My top concern in a dog of his size is that he may get dehydrated if we cannot keep enough water in him. So, this is good that he is eating.

What can you try at home before you take him to his vet on Monday? You may administer Pepcid AC (famotidine) 10mg at 1/4 (one-fourth) tab every 12hours. This you may get over-the-counter at any pharmacy. It helps with nausea. Second you should try offering a bland diet of white rice and boiled chicken breast. My top concern with doing these two suggestions is that he is not eating and vomiting; so there is a chance neither will stay down. But do your best.

As well you can try offering an electrolyte solution such as Pedialyte for kids (non-flavored is best) or Gatorade. I cannot say dogs like this a lot but it cannot hurt to try. If you try these suggestions and he develops profuse vomiting today or becomes very depressed/lethargic then I am afraid this has become an emergency situation and you do need to consider driving to this ER clinic. As long as he seems stable and comfortable with no profuse vomit/diarrhea or lethargy then you can continue at-home therapy.