Start with a small amount
The first serving of anything new should be conservative — a taste rather than a portion. A small amount limits the impact if the food does not agree with your dog, and it still tells you everything you need to know about how they react.
There is no single gram amount that works for every dog, and we deliberately do not publish one. A 4 kg terrier and a 40 kg retriever experience the same spoonful very differently, and food type matters too: a slice of cucumber and a spoonful of peanut butter are not comparable. Your dog's normal diet, appetite, body condition and health history all change what a sensible first taste looks like.
A useful mental check: would this amount matter if your dog ate nothing else unusual today? If the answer is yes, halve it. You can always offer a little more tomorrow.
Introduce one new food at a time
If you offer a new biscuit, a new fruit and a spoonful of leftovers in the same evening and your dog has loose stools the next morning, you have learned almost nothing. Any of the three could be responsible, or the combination, or the total volume.
Introducing one food at a time turns a guess into information. Give the new food, then wait before adding anything else new. Many owners find a gap of a couple of days comfortable, because digestive reactions do not always show up within the hour.
Keep the rest of the day ordinary while you are testing. Same meals, same amounts, same routine — so the new food is the only variable.
Keep the preparation simple
Plain is safer. Plain cooked, plain raw where appropriate, no extras. Most of the trouble with human food comes from what is added to it rather than the food itself.
Skip seasoning, salt, butter and oil, sauces, marinades, gravy, sweeteners and anything containing onion or garlic — including powders and stock. Sweetened foods deserve particular care because xylitol is dangerous to dogs even in small amounts.
Also look at the whole product rather than the headline ingredient. A blueberry muffin is not a blueberry. If you are unsure about a specific food, check it in the A–Z food directory first, or read our category guides for fruit and vegetables, which cover preparation as well as classification.
Preparation also affects choking and blockage risk. Remove pits, stones, cores and tough skins, and cut firm foods into pieces that suit your dog's size.
Watch your dog afterward
Most reactions to a new food show up in the digestive system within a day. Practical things to notice include vomiting, diarrhoea or unusually soft stools, more gas than normal, scratching, licking or other unusual discomfort, reduced appetite, or a dog who simply seems flat and off-form.
One soft stool in an otherwise happy dog is common and usually settles. What matters more is the pattern: is it repeating, getting worse, or accompanied by other signs?
We cannot tell you from a web page whether a reaction is an intolerance, an allergy or a coincidence — that is a diagnosis, and it needs a vet who can examine your dog. What we can say is that persistent, severe or worsening symptoms are a reason to stop offering the food and get veterinary advice. The same applies to repeated vomiting, blood in vomit or stools, a distended or painful abdomen, lethargy, breathing difficulty or facial swelling, which warrant prompt contact with a vet rather than watchful waiting.
If your dog has eaten something you believe is toxic, contact your vet or an animal poison control service straight away, even if your dog seems fine. Do not wait for symptoms and do not try to treat a suspected poisoning at home.
Foods that require extra caution
Gradual introduction is a tool for foods that are safe in principle. It does not make an unsafe food safe. Grapes and raisins, chocolate, onions and garlic, macadamia nuts, xylitol-sweetened products, caffeine and alcohol appear on standard veterinary toxin lists, and a tiny first taste is still a tiny dose of something harmful.
Our toxic foods guide collects those foods in one place, along with the ones we classify as best avoided rather than outright toxic. Read it before you experiment with human food, not after.
There is also a group of foods that are not toxic but carry mechanical risk — cooked bones, large stones and pits, corn cobs, and anything a dog is likely to swallow whole. Those are worth avoiding regardless of quantity.
Puppies, senior dogs and dogs with health conditions
Puppies are growing on a diet that is balanced for that job, and their stomachs are less forgiving of experiments, so extras should stay small and occasional. Older dogs often have less digestive tolerance and may be on medication that interacts with what they eat.
If your dog has a chronic condition, a history of pancreatitis or digestive disease, food sensitivities, weight-management needs, or is on a prescribed or veterinary diet, talk to your vet before introducing unfamiliar foods. A prescribed diet only works as prescribed, and extras can undermine it in ways that are not obvious from the outside.
We do not give condition-specific feeding instructions here. Your vet has your dog's history and can tell you what fits it.
A simple introduction checklist
- Confirm the food is dog-safe before offering it
- Prepare it plainly, with no seasoning, sauces or sweeteners
- Remove pits, stones, cores and tough skin, and cut to a suitable size
- Start conservatively — a taste, not a portion
- Introduce only one new food at a time
- Keep the rest of the day and the usual meals unchanged
- Watch for digestive or behavioural changes over the next day
- Stop offering the food if concerning symptoms appear
- Contact your vet if symptoms are severe, persistent or worsening, or if a toxic food may have been eaten