A dog skipping a meal can feel out of character, especially when they normally appear the moment a cupboard door opens. A change in appetite can have many causes, from a disrupted routine to pain or illness, and it is not something to diagnose from home.
Quick answer
- A change in how your dog eats is worth taking seriously, even when the rest of the picture is not yet clear.
- Call your vet promptly if your dog has stopped eating, is eating much less than usual, or seems uncomfortable trying to eat.
- Seek urgent veterinary help now if there is trouble breathing, collapse, repeated retching, a swollen tummy, severe pain, seizures, suspected poisoning or a marked change in alertness.
- Keep a short record of what changed and when. It can make the call with your vet much more useful.
First, notice the pattern rather than guessing the reason
“Not eating” can look different from one dog to another. Some dogs turn away from a full bowl. Some show interest but seem unable or unwilling to pick food up, chew or swallow. Others eat a little but far less than normal.
The distinction is useful to record, but it does not tell you the cause. Appetite can change for many reasons, including discomfort, dental or mouth problems, stomach upset, stress, a change in routine or an underlying illness. Your own vet is the right person to work out what is going on for your dog.
When should I call the vet?
Contact your vet if you notice a change in your dog’s usual eating habits. PDSA advises seeking veterinary advice promptly if a dog has not eaten anything for more than 24 hours. Do not wait for that point if your dog is very young, elderly, pregnant, has a diagnosed condition, takes medication, follows a prescribed veterinary diet, or simply seems unwell.
You know your dog’s normal routine better than anyone. If the change is sudden, unusual for them or worrying to you, call the practice and explain what you have seen. They can advise how quickly your dog needs to be assessed.
Red flags that need urgent veterinary help
Contact your vet or an emergency veterinary service straight away if a dog who is not eating also has any of the following:
- difficulty breathing, blue or very pale gums, collapse or a seizure
- repeated unproductive retching, a swollen or painful-looking abdomen, or an inability to settle
- repeated vomiting, blood in vomit or stool, or sudden severe diarrhoea
- marked weakness, confusion, a major change in responsiveness or severe pain
- difficulty swallowing, heavy drooling, obvious mouth pain or an inability to keep water down
- a suspected poisoning or access to a harmful substance, medicine, plant or chemical
If poisoning may be involved, contact your vet immediately. Animal PoisonLine is also a UK 24-hour specialist service for suspected toxic exposures. Do not try to make your dog vomit at home unless a veterinary professional has specifically told you to do so.
Useful details to have ready for the call
A short note is more helpful than a long detective story. Before you call, write down what you know:
- when your dog last ate their usual amount and whether they have eaten or drunk anything since
- whether they approach food, try to eat and stop, or show no interest at all
- any vomiting, diarrhoea, retching, drooling, coughing, changes in toileting, drinking or behaviour
- anything new in the last day or two, such as a routine change, travel, new food, medication or access to a bin, plant, chemical or human medicine
- your dog’s age, any known conditions, current medication and any veterinary diet
If it is safe to do so, a brief video of behaviour around the bowl can also help your vet understand what you mean by “not eating”. Do not delay a call to collect more information when a red flag is present.
What not to do while you are deciding
- Do not assume a favourite treat proves there is no problem.
- Do not force food or water into your dog’s mouth.
- Do not give human medicines, leftover veterinary medicines or home remedies.
- Do not change a prescribed diet or add foods without checking with the vet who set the plan.
- Do not try to make your dog vomit after a suspected poisoning.
Keep fresh water available unless your vet gives you different instructions. If your dog cannot keep water down, is having trouble swallowing, or seems distressed, contact a vet urgently.
A simple decision checklist
- Is this a clear change from my dog’s normal appetite?
- Are they eating nothing, much less than usual, or struggling to eat?
- Is there vomiting, diarrhoea, pain, bloating, breathing difficulty, collapse or a marked behaviour change?
- Could they have accessed something harmful?
- Are they a puppy, an older dog, on medication, unwell already or following a veterinary feeding plan?
- Have I called my vet if I am unsure?
The bottom line
A dog refusing food is a sign to pay attention, not a mystery to solve with a kitchen experiment. Make a note of the change, look for urgent warning signs and speak to your own vet early. This article offers general information and does not replace advice for your individual dog.
Reviewed: 10 August 2026.
