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My four-month-old kitten threw up yellow-green foamy fluid all day yesterday, has been lethargic and refusing food/water all day, with bad breath; before that it may have drunk spoiled milk (not sure) – is it just an upset stomach? I gave a little probiotics and omeprazole; should I go to the hospital?
Yellow-green foamy vomit may come from spoiled food, parasites, prolonged fasting, infectious disease, pancreatitis, hepatitis, or kidney damage. If vomiting is not frequent, withhold food and give glucose water and probiotics; spoiled milk may cause gastroenteritis, so pet anti-inflammatory helps, then feed soaked kibble in small amounts once it stops. If vomiting is frequent or with fever, arched back, pain, or lethargy, see a vet for the cause.
What happens when a dog has an upset stomach?
An upset stomach can cause vomiting, diarrhea, abdominal pain, poor appetite, bad breath, and lethargy; the dog may hunch and avoid being touched. Withhold food and see a vet if it persists, as causes include gastritis, blockages, or infection.
What are the signs of an upset stomach in dogs?
An upset stomach shows as poor appetite, arched back, lethargy and reluctance to move. Indigestion adds vomiting; gut imbalance or gastritis adds soft stool or diarrhea; parvo/corona adds fever and bloody stool.
What to Do When Your Dog Has an Upset Stomach, Vomiting and Diarrhea?
Dogs eat first and think later, so an upset stomach with vomiting and diarrhea is a frequent complaint. The right first step depends on what went in: a suspected toxin is an emergency, while a mildly irritating food can often be managed at home with fasting, fluids, and gut support. This guide explains when to head straight to the clinic, the step-by-step home care that eases symptoms, and the underlying causes—spoiled food, diet changes, or infection—that every owner should rule out, especially in unvaccinated dogs.

What to Do When Your Dog Has an Upset Stomach or Diarrhea
Have you seen a dog eat grass and vomit? Eating grass signals stomach upset; check temperature. Normal dog temperature is 37.2 to 38.3 C. Do not self-treat, especially with human medicine - it may harm more.

What to Do When Your Cat Has an Upset Stomach and Diarrhea
An upset stomach with diarrhea in a newly homed cat is almost always a sign of a sensitive digestive system, not bad luck. The fix is gentle: ease the transition to new food, avoid toxic human scraps, and watch for dehydration that means a vet visit.
I hand-fed my dog a few handfuls of a sweet drink; will it upset the stomach?
Dogs should not drink soda; the high sugar can irritate the gut and cause acute gastroenteritis. A small amount usually does little harm, so watch for adverse reactions and see a vet if discomfort is significant. Normally give plain cooled or warm water instead.

How to Support a Cat with a Sensitive Stomach
Some cats have notoriously delicate digestions—the so-called glass stomach—prone to soft stools, diarrhea, and vomiting. The key to managing it is diet. Choose a limited-ingredient, single-protein hypoallergenic food, feed small meals several times a day, and always transition new food over seven days. Pet-specific probiotics (mixed into water below 40°C so the live cultures survive) help rebalance gut flora, while a calm, low-stress home prevents flare-ups. If symptoms persist or worsen, a vet check and possibly a prescription gastrointestinal diet are the right next steps.

What to Feed a Cat with a Sensitive Stomach
Many cats have delicate digestion, leading to vomiting, diarrhea, and bloating if diet is ignored—and chronic trouble can cause dehydration. This guide covers the warning signs, common causes, and the best foods (gentle kibble, prescription diet, probiotics, and plain toppers) to settle a sensitive stomach.
I fed some apple recently along with normal hamster food; this started yesterday. Today he’s energetic — is it wet tail, or a stomach issue?
From your description, the golden hamster very likely has wet tail. Weaning, environment change, diet upset, a dirty cage, or overcrowding can cause it. First control water intake and keep food fresh and the environment good; if no improvement, use gentamicin, probiotics, and antidiarrheal medication.