One vomit and repeated vomiting are different problems
Many dogs vomit once after eating grass, gulping food, or scavenging something disagreeable, then act completely normal afterward. That single episode in a bright, drinking adult dog can reasonably be watched at home. Vomiting repeatedly within a few hours, vomiting again the next day, or vomiting alongside diarrhea, lethargy, loss of appetite, or obvious discomfort should prompt a vet call the same day.
Why retching without producing anything is urgent
Owners often group retching with ordinary vomiting, but unproductive retching in a medium or large dog, especially with restlessness, drooling, pacing, and a swelling abdomen, is treated as an emergency presentation. Do not offer food to test the stomach and do not wait until morning to see if it settles. Puppies are a separate urgency again: they dehydrate fast, their blood sugar can fall, and vomiting may be an early sign of infections they are not yet fully protected against. Small and toy breeds, senior dogs, and dogs with existing conditions also have less reserve, so the threshold for being seen is lower and earlier than for a robust adult dog.
What to note about each episode
Your vet will ask questions that are hard to answer from memory at midnight, so write them down as you go. Record the time of each vomit, whether it followed food, water, exercise, or a walk, and what it contained: undigested food long after a meal, yellow bile on an empty stomach, foam, grass, or foreign material. Note whether your dog can keep small amounts of water down, whether stool is normal, and whether energy and responsiveness look right between episodes. Photograph an unusual vomit if you can face it, and keep any suspected chewed object or packaging to show the vet, rather than describing it approximately.
What to do at home while you arrange the visit
Do not give human stomach remedies or leftover medication unless the vet directs it for this dog and this episode. Watch puppies and small dogs especially closely for weakness, wobbliness, or gums that feel dry and tacky. If vomiting stops but appetite and energy do not return within the timeframe the vet gave you, call back rather than assuming the problem has passed.
What the vet is trying to rule out
A vomiting dog may have eaten something irritating, swallowed an obstruction, developed inflammation in the stomach, pancreas, liver, or kidneys, or be showing an early sign of a wider illness. The examination, your episode timeline, and sometimes blood tests or imaging help separate a stomach upset that needs support from a blockage that needs urgent intervention. That is why exactness helps: three vomits or eight, food kept down or not, a missing squeaker or none, are facts that change decisions. Tell the vet about every access point you know, including bins, compost, other pets' food, dropped human medication, and garden chemicals, even if you are not sure anything was taken.
Keeping an episode record for next time
Vomiting episodes that recur every few months deserve a record, not a shrug. Note dates, suspected triggers, what was eaten in the preceding day, how long the episode lasted, and what the vet concluded. Over a year, that log can reveal a pattern, such as episodes following fatty leftovers or a particular chew, that lets you prevent the next one instead of just treating it. KinsLe's Pet Passport holds those episode timelines, diet notes, and vet conclusions together for a dog who vomits, so each new episode is judged against real history.