Vomiting food and increased salivation (a sign of nausea) can be due to many different things in a dog. It can be viral, something ingested/ foreign body, metabolic or something going on with organ function, or even an infection
1- Keep indoors to avoid eating grass/ leaves for 6-8 hours from last vomiting episode. If he is still salivating a lot then please remove water as well for this period of time to allow the intestinal tract to rest and stop any abdominal contractions and waves of nausea
2- Offer a small amount of water (1-2 teaspoons hourly) for a few hours in 6-8 hours
3- Start Pepcid (famotidine) 0.25 mg/ pound every 12 hours OR prilosec (omeprazole) 0.5 mg/ pound daily for the next 3 days with the second administration of water (crushed if needed)
4-If no vomiting, offer small amount of white rice and boiled boneless or ground chicken or ground beef. For example, one tablespoon hourly for a few hours then slowly start to increase the amount while reducing the frequency. Keep on this diet for several days then wean into regular diet.
5- If vomiting continues after doing the above, I would encourage having your family veterinarian perform an examination to determine the next step to getting your dog comfortable and what exactly the underlying cause is.
Indications your dog should be seen by a veterinary er sooner include: sticky gums that are pale, yellow, blue, purple, temperature rectally >103.5, progressive lethargy with less responsiveness to you, vomiting or diarrhea that includes blood, resting respiratory rate (breaths per minute) >60, swollen abdomen.
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