Dog not eating (loss of appetite)

Recognise the signs

• Dog approaches food bowl but walks away without eating
• Dog sniffs food and turns away
• Eating only treats or hand-fed titbits but refusing bowl food
• Partial meals — eating some but leaving the rest
• Complete food refusal for more than one meal
• Weight loss visible over days to weeks
• Associated signs (which determine urgency): vomiting, diarrhoea, lethargy, distended abdomen, drooling, pawing at mouth, straining to toilet, blood in stool or vomit

First aid steps

1. 1. Note exactly when the dog last ate and how much — give this information to your vet.
2. 2. Remove the food bowl after 20 minutes — leaving food out all day can create food-anxiety patterns and masks the true severity of inappetence.
3. 3. Check the mouth briefly if safe to do so — look for obvious swellings, broken teeth, or foreign material.
4. 4. Offer a small amount of bland food: plain boiled chicken breast (no skin, no salt) or plain boiled white rice to see if the dog will eat something gentle.
5. 5. Ensure fresh water is always available — dehydration on top of inappetence worsens any underlying condition.
6. 6. Monitor for red flag signs: vomiting, lethargy, bloated or painful belly, blood in stool or vomit — these require same-day vet contact regardless of how long the dog has not eaten.
7. 7. Weigh your dog if possible and record it.
8. 8. If the dog has not eaten for 24 hours and is also lethargic or vomiting, contact your vet today — do not wait another day.
9. 9. If the dog has not eaten for 48 hours with no other symptoms, contact your vet — even without other signs, 48 hours of complete food refusal warrants assessment.
10. 10. For diabetic dogs: contact your vet immediately if the dog will not eat before its insulin injection — giving insulin to a dog that has not eaten can cause dangerous hypoglycaemia.

While transporting to the vet

• No special precautions for transport unless the dog is also vomiting, collapsed, or in pain.
• Bring any uneaten food or note what the dog last ate.
• Bring any medications the dog is currently taking.
• If you suspect a foreign body, inform the vet before arrival.

When it can usually wait

• One missed meal in an otherwise bright, active, healthy adult dog
• Dog eating treats and showing normal energy but refusing usual kibble (likely food preference rather than illness)
• Dog eating less in hot weather with normal energy and no other signs
• Dog that skips a meal after the stress of travel or kennels

Common causes

• Stress or anxiety — new environment, changes in household, new pet, owner absence
• Change in food brand, flavour, or texture
• Dental pain — tooth decay, gum disease, broken tooth, oral mass
• Nausea from car travel, medications (especially antibiotics, NSAIDs), or anaesthesia
• Mild gastrointestinal upset — dietary indiscretion, gastroenteritis
• Systemic illness of any kind — kidney disease, liver disease, diabetes, Addison's disease, cancer
• Pain from any source making the dog reluctant to move to their bowl
• Seasonal variation — some dogs eat less in summer heat
• Being in season (bitches)
• Boredom with the food — especially with highly palatable wet food or treats regularly given
• Foreign body ingestion causing partial or complete obstruction
• Toxin ingestion

What the vet will need to know

• When exactly did the dog last eat a full meal?
• Any change in food brand or type recently?
• Any other symptoms — vomiting, diarrhoea, lethargy, coughing, increased thirst?
• Has the dog's weight changed?
• Current medications and when last given
• Any possibility of dietary indiscretion (scavenging, foreign body)
• Any recent stressful events — kennel stay, new pet, house move?
• Any pawing at the mouth, excessive drooling, or difficulty chewing?

Aftercare

• If an underlying cause is identified, follow the specific aftercare for that condition.
• After a period of inappetence from GI upset: reintroduce food gradually with a bland diet (plain chicken and rice) before returning to normal food.
• Weigh weekly until appetite fully normalises.
• If a dental cause was found: follow post-dental care instructions including soft food during healing.
• For medication-induced nausea: ask your vet about giving medication with food, anti-nausea medication, or alternative drug options.

Prevention

• Maintain a consistent feeding routine — same food, same time, same place.
• Avoid excessive treats and high-value food toppers that make regular food seem unappealing.
• Annual dental checks — dental pain is a very common but under-recognised cause of reduced appetite.
• Manage stress — gradual introductions to new environments, pets, or routines.
• Regular health checks for senior dogs to catch conditions like kidney disease, liver disease, or cancer early.
• Weigh your dog monthly — unexplained weight loss is an important early sign of many conditions.

Breed-specific notes

• Chihuahuas, Toy Poodles, Yorkshire Terriers, and other tiny breeds: at risk of hypoglycaemia if food is withheld — urgent if not eating.
• Greyhounds and Sighthounds: naturally lean and can lose weight quickly when not eating — monitor closely.
• Labradors and Beagles: notoriously food-motivated — refusal to eat in these breeds is a more significant warning sign and warrants earlier vet contact.
• Cocker Spaniels: prone to exocrine pancreatic insufficiency and pancreatitis — both affect appetite and may need specific diagnosis.

Frequently asked questions

Related topics

• Dog vomiting — when to worry
• Dog with diarrhoea — when to worry
• Kidney disease in dogs