Why Won't My Dog Eat? Top 10 Causes & UK Vet Advice 2025

Why Won't My Dog Eat? Top 10 Causes and Trusted UK Vet Advice for 2025

Sudden or ongoing loss of appetite in dogs can be worrying, often signalling underlying health or behavioural issues. This detailed guide explains the top 10 reasons why your dog might refuse food, paired with expert UK veterinary advice for 2025. You'll learn how to recognise symptoms, when to consult your vet, and how to promote responsible pet ownership. Always remember, never give Calpol or human medications to dogs without veterinary guidance, as some can be harmful or fatal.

Top 10 Causes of Appetite Loss in Dogs

1. Stress and Anxiety

Changes like moving house, fireworks, visitors, or new pets may upset your dog, leading to decreased appetite. Separation anxiety is a frequent cause. Establish calm, consistent feeding routines to help your dog feel secure. If appetite loss persists due to stress, seek professional veterinary advice for behavioural or medical support.

2. Dental and Mouth Problems

Dental pain from gum disease, tooth abscesses, broken teeth, or stomatitis can make eating uncomfortable. Look for drooling, bad breath, pawing at the mouth, or reluctance to chew. Regular veterinary dental checks, brushing with vet-approved toothpaste, and dental chews support good oral health and appetite.

3. Chronic Pain or Illness

Arthritis, kidney or liver disease, cancer, diabetes, or infections often reduce appetite. Dogs may hide pain, so watch for changes in energy or behaviour. Early veterinary diagnosis and tailored treatment improve quality of life and can help restore appetite.

4. Digestive Problems and Infections

Nausea, vomiting, diarrhoea, intestinal blockages, or worm infestations affect hunger and nutrition. Prompt vet care is essential. Your vet might recommend bland diets like boiled chicken and rice, plus ample hydration, to aid recovery.

5. Infection or Fever

Infections cause fever and lethargy, naturally suppressing appetite. Veterinary diagnosis and treatment are important to restore normal eating patterns.

6. Medications and Vaccinations

Appetite loss can be a side effect of some medicines or vaccinations. Monitor your dog after new treatments and contact your vet if decreased appetite lasts over 48 hours or worsens.

7. Picky or Fussy Eating Behaviour

After ruling out medical causes, fussiness might stem from boredom or preferences for certain foods or textures. Offering varied, balanced diets can keep your dog interested without compromising health.

8. Age-Related Changes

Older dogs may have reduced senses of smell and taste, dental wear, or health problems affecting appetite. Soft foods and senior-specific diets, alongside regular vet checks, support nutrition and comfort.

9. Environmental Changes

New guests, holidays, renovations, or changes in routine can induce mild stress, temporarily reducing appetite. Maintain consistent feeding locations and times to ease adjustment.

10. Psychological Causes and Eating Disorders

Rarely, dogs develop disorders like pica (eating non-food items) or compulsive overeating. These require combined veterinary and behavioural interventions for safety and wellbeing.

UK Vet Tips: What to Do if Your Dog Won't Eat

1. Observe and record symptoms: Note any vomiting, diarrhoea, coughing, chewing difficulty, or behavioural changes to inform your vet.
2. Check oral health: Inspect for swollen gums, broken teeth, or signs of mouth discomfort.
3. Ensure hydration: Provide fresh water regularly. Ice cubes or low-sodium bone broth can encourage drinking in reluctant dogs.
4. Offer tempting food: Warm meals slightly or use bland diets like boiled chicken and rice to stimulate appetite and soothe digestion.
5. Limit treats: Avoid excessive treats that might suppress hunger during meals.
6. Seek veterinary advice promptly: Contact your vet if your dog refuses food for over 24–48 hours or shows worrying symptoms.
7. Follow veterinary diagnostics: Vets may perform blood tests, X-rays, or ultrasounds to diagnose causes.
8. Reduce stress: Provide a calm, consistent feeding environment at regular times.

Can I Give My Dog Calpol?

Never give Calpol or any human paracetamol medication to dogs. Calpol contains paracetamol and often xylitol, a sweetener toxic to dogs, causing liver and kidney damage, low blood sugar, seizures, or death. UK vets prescribe veterinary-approved pain relief products safe for dogs. If your dog accidentally consumes Calpol, seek emergency veterinary care immediately.

How to Buy a Dog or Puppy Responsibly in the UK

• Purchase puppies from responsible Kennel Club-registered breeders or recognised breed clubs prioritising health and welfare.
• Visit breeders to inspect conditions, meet the mother and littermates, and review health records.
• Ensure puppies are microchipped, vaccinated, and vet-checked before bringing them home.
• Avoid puppy farms, pet shops, or unverified sellers that compromise welfare.
• Consider adopting from reputable rescue centres to give dogs a loving home.

Best Food for Great Dane puppies in the UK

Large breeds like Great Danes require perfectly balanced diets with appropriate calcium and phosphorus levels to support healthy bone and joint development.

• Opt for high-quality animal proteins such as chicken, lamb, or fish.
• Include DHA for brain and eye development.
• Use prebiotics and omega-3 fatty acids to aid digestion and coat health.
• Avoid artificial colours, flavours, and preservatives.

Trusted UK puppy food brands suitable for large breeds include James Wellbeloved, Arden Grange, and Royal Canin Large Breed Puppy. Always follow feeding guidelines and monitor growth with help from your vet.

When Can Puppies Leave Their Mother?

UK law mandates puppies stay with their mother and littermates for a minimum of eight weeks, ensuring social development, bite inhibition, and protection transfer. Responsible breeders ensure puppies are fully weaned, vaccinated, microchipped, and vet-checked before rehoming. Import regulations require puppies to be at least six months old before entering the UK, aiming to reduce low-welfare imports. Vets often advise waiting until about ten weeks to promote optimal socialisation.

When Should I See a Vet if My Dog Won't Eat?

Quick Answer: Contact your vet urgently if your dog refuses food for more than 24 hours, especially with vomiting, diarrhoea, lethargy, or if your dog is a puppy, senior, or small breed at risk of low blood sugar.

Healthy adult dogs may fast briefly up to 48 hours, but persistent or concerning loss of appetite needs prompt vet evaluation. Puppies and small breeds are vulnerable to hypoglycaemia and dehydration and require speedy intervention. Early veterinary diagnosis enhances treatment success and prevents complications.

Promoting Responsible Pet Ownership

Owning a dog is a lifelong commitment involving ethical acquisition, regular veterinary care, quality nutrition, and mental and physical enrichment. Monitoring appetite and behaviour helps maintain health. Always seek timely veterinary help if your dog shows signs of illness or refuses food. Responsible ownership ensures a happy, healthy life for your canine companion.