If your dog has been eating normally and their usual eating habits suddenly change out of the blue, contact your vet for advice. The important thing is the change from what’s normal for your dog, whether sudden or gradual.
The priority is understanding what has changed, rather than finding a more tempting meal. A few notes can help your vet, but you do not need a complete diary before making the call.
Eating less is not automatically an emergency. Ask your vet how soon your dog needs checking. PDSA’s appetite guidance gives no fixed waiting period for reduced appetite. It advises seeing a vet very quickly if your dog has eaten nothing for more than 24 hours. This is not advice to wait 24 hours: seek help sooner if your dog is unwell or the risks below apply.
When to get veterinary help urgently
Call your vet or an emergency veterinary service immediately if your dog has difficulty breathing, collapses, seems in severe pain, has a suddenly swollen tummy, or repeatedly tries to vomit without bringing anything up. Do not wait for the next meal or for your usual practice to reopen. Blue Cross’s emergency guidance explains these warning signs.
Mention straight away if your dog is a puppy, an older dog or has an existing health condition. Blue Cross highlights repeated vomiting in young or older dogs as a possible emergency. If your dog has diabetes and does not eat their usual food, PDSA advises calling your vet practice for advice.
Contact your vet promptly about an appetite change alongside vomiting, diarrhoea, unusual tiredness, pain, weight changes or drinking more or less than usual. You do not need to wait for several symptoms to appear.
Why a new appetite change needs checking
A dog may feel hungry but find eating uncomfortable. Mouth or dental pain can make chewing difficult, while nausea, pain elsewhere or other illness can reduce interest in food. Changes at home and stress can also affect eating.
The bowl alone cannot tell you the cause. Do not assume a new change is simply fussiness. Veterinary assessment can help establish what is happening and what support your dog needs.
What to tell your vet
Start with what is different from your dog’s normal pattern. The Royal Veterinary College’s advice on preparing for a vet appointment recommends noting when the problem began and any recent medicines. If you can, have these details ready:
- When it began: when you first noticed the change and when they last ate normally.
- What they have eaten: the food offered, roughly how much was eaten, and any treats, chews or other food.
- What they have drunk: whether they are drinking more, less or about the same as usual.
- Other changes: vomiting, diarrhoea, tiredness, discomfort, trouble chewing, weight changes or different toilet habits.
- Relevant background: their age, existing conditions, medicines, prescribed diet and any recent changes to food or routine.
A photo of the food packaging can also be useful if your vet asks about their diet. Our practical dog-food label guide explains composition and feeding information.
If you do not know an amount or a time, say so. An estimate is useful; gathering details should never hold up an urgent call.
If your dog is eating more than usual
A new increase in appetite is worth mentioning too, especially if your dog is losing weight, drinking more or weeing more often. PDSA explains that some medicines and health conditions can cause excessive hunger. Tell your vet about the whole pattern rather than trying to identify a cause yourself.
Before the appointment
Ask the practice what to do about food, water and any regular medicines before your dog is seen. Follow their instructions, particularly if your dog has a diagnosed condition or a prescribed diet.
Do not use new food, toppers or a feeding “reset” to put off veterinary advice. If your dog gets worse or develops new symptoms, contact the practice again rather than waiting for the appointment.
This article draws on published guidance from UK veterinary organisations and animal charities. It provides general information, not a diagnosis or individual treatment advice.
Your next step
If your dog’s appetite has changed, contact your vet and explain what you have noticed. They can advise how urgently your dog needs to be seen and what to do next. For the emergency signs above, call immediately.
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