Dog Not Eating in Hot Weather? Why it Happens and What to Do

Last Updated: 22 June 2026
0 Comments

Your dog has turned their nose up at dinner, and the panic has set in. Are they ill? Bored of their food? Or is it simply too hot to eat? As the temperature climbs and the bowl gets ignored, this is one of the more common summertime concerns dog owners raise. In most cases, there is a straightforward biological explanation for a dog not eating in hot weather. Understanding this reason, and knowing what to do about it, makes all the difference between unnecessary worry and confident, informed action.

Author: Anna Bain

Dog Not Eating in Hot Weather? Why it Happens and What to Do

Contents

Blog in 60 Seconds
Is It Normal for Dogs to Lose Their Appetite in Hot Weather?
Signs Your Dog Isn’t Eating Due to the Heat
Why Dogs Stop Eating in Hot Weather
Cooling Foods That Can Help
Practical Feeding Tips for Dogs Not Eating in Hot Weather
Raw Dog Food in Summer: Does Your Dog Need Less?
Supplements That Support Dogs in Hot Weather
Heatstroke in Dogs: Signs and What to Do
Signs of Heatstroke
What to Do If You Suspect Heatstroke
Supporting Your Dog Through the Warmer Months
FAQs
References

Blog in 60 Seconds

In this guide, you will learn:

Why dogs naturally eat less in hot weather and the biology behind it
How to tell the difference between normal heat-related appetite changes and warning signs that need attention
Which foods to offer, and which to avoid, when temperatures rise
Practical feeding adjustments that make summer mealtimes easier for your dog
What to do if you suspect heatstroke, and when to call the vet

I’m Anna Bain, accredited canine nutritionist and writer at ProDog. I’ve spent years helping dog owners navigate the questions that come up as the seasons change, and “Why is my dog not eating in hot weather?” is certainly a common one that we hear each summer. The answer is rarely cause for alarm, but it does deserve a closer look.

In this guide I’ll take you through what’s really happening when your dog goes off their food in warm weather, how to adjust their routine with confidence, and how to recognise the signs that warrant a call to the vet. As with most things in canine nutrition, the more you understand the ‘why’, the easier the ‘what to do’ becomes.

Is It Normal for Dogs to Lose Their Appetite in Hot Weather?

Yes, in most cases it is completely normal. Just as many of us lose interest in a heavy meal when it is sweltering outside, dogs experience a natural reduction in appetite when temperatures rise. Their metabolism slows, their energy needs decrease, and the body prioritises staying cool over processing food.

That said, a dip in appetite is different from a total food refusal. Most dogs will still eat in warm weather, even if with less enthusiasm than usual. If your dog is picking at their food rather than wolfing it down, adjusting their routine is usually all that’s needed. If they are refusing food entirely, losing weight, or showing other symptoms alongside the appetite change, that is worth investigating further.

Signs Your Dog Isn’t Eating Due to the Heat

When appetite changes are heat-related rather than illness-related, you will typically notice a pattern. The clues are usually in the timing and context.

Common signs that the heat is behind the change:

Eating less during the hottest parts of the day, but showing more interest in food during cooler morning or evening hours
Generally slower and more lethargic, resting in cool spots or seeking shade
Drinking more water than usual
Still showing interest in food but eating smaller portions than normal
Improvement in appetite on cooler days or after the temperature drops

When Should I Be Worried?

A reduction in appetite during hot weather is usually temporary and resolves on its own. The situations that warrant closer attention include:

Your dog refuses food for more than 24 to 48 hours
There is rapid or significant weight loss
Your dog is not drinking water
You notice vomiting, diarrhoea, or changes in stool
Your dog seems confused, unusually weak, or unresponsive
The appetite loss is not linked to temperature patterns

Any of the above alongside a reduced appetite is reason to contact your vet. Appetite loss can sometimes signal an underlying condition that has nothing to do with the weather, and it is always better to rule that out.

When to Call the Vet

Call your vet promptly if your dog has not eaten for more than 48 hours, is showing any signs of illness alongside the appetite change, or if you have any doubt at all. Dogs with pre-existing health conditions, very young puppies, senior dogs, and flat-faced breeds are more vulnerable in hot weather and deserve a lower threshold for a vet call.

Why Dogs Stop Eating in Hot Weather

There are several interconnected reasons why warm weather suppresses your dog’s appetite. Understanding them makes it much easier to respond with confidence:

Thermoregulation: Why Digestion Takes a Backseat

In hot weather, a dog’s priority becomes regulating core temperature, not digesting dinner. The body needs to shed heat to stay safe, and eating itself creates internal heat through digestion.[1]

In fact, research shows that in warm environments, metabolism and digestion slow down to reduce heat production, directing resources toward cooling instead.

This is why you might notice your dog picks at their food when the mercury rises. It’s not fussiness, it’s biology. Redirecting energy to stay cool is a survival move.

That said, while heat can suppress appetite, it shouldn’t cause total refusal or dramatic weight loss. You’ll want to observe patterns, rule out underlying issues, and adjust their feeding routine to support their changing needs. Interestingly, the opposite happens in colder weather. In fact, a study from Cornell University found that:

“A group of Beagles studied in Alaska ate twice as much in cold weather, but still lost weight in the harsh Arctic winter” [2]

Something to keep in mind when summer fades and winter rolls in. Seasonal shifts affect appetite in both directions.”

Reduced Activity and Lower Energy Needs

Most dogs are less active in summer. Shorter walks, more time resting indoors, less vigorous play. Less movement means less fuel is needed. When your dog’s energy output drops, it makes sense for their food intake to follow. This is not fussiness; it is the body doing its job and calibrating intake to demand.

Dog Not Eating Food? Causes, Solutions, and Tips

Cooling Foods That Can Help

Some whole foods have naturally high water content and can support hydration and comfort during warm weather. The following are dog-safe options you can offer in moderation, mixed into meals or given as treats:

Cucumber: hydrating, low calorie, and refreshing
Watermelon (flesh only, no seeds or rind): water-rich with natural electrolyte support
Celery: crunchy and hydrating
Blueberries: antioxidant-rich and cooling
Apple slices (no core or seeds): crisp and refreshing

These can be blended into raw meals or offered frozen as enrichment. My personal go-to is frozen bone broth treats: fill an ice mould with dog-friendly bone broth, add finely chopped fruit or veg, and freeze. Most dogs love them, and they are an easy way to boost hydration and mental enrichment at the same time.

Foods to Avoid Giving Your Dog in Summer

Summer brings with it a particular set of hazards, especially around BBQs and picnics. The following foods must be kept well out of reach:

Grapes and raisins: toxic and potentially fatal
Corn on the cob: a serious choking and obstruction risk, even cooked
Ice cream and human ice lollies: high in sugar, often contain xylitol or other sweeteners that are toxic to dogs
Salted or seasoned BBQ foods: onions, and high salt content are all harmful
Cherries: the pits and plant contain cyanide

If you are hosting a BBQ or eating outdoors, keeping your dog in a separate safe space during food preparation and eating is the simplest way to prevent accidental ingestion.

Need help with your dog’s diet?

Contact ProDog’s expert team today for FREE tailored canine nutrition advice

Contact Us

Practical Feeding Tips for Dogs Not Eating in Hot Weather

Adjust Mealtimes to Cooler Parts of the Day

This is one of the most effective adjustments you can make. Dogs are more likely to eat well when their body is not already in heat-management mode. Shifting meals to early morning and late evening, when temperatures are lower, makes food more appealing and digestion easier. If your dog is consistently reluctant to eat at midday in summer, that is the routine change to make first.

Add Water to Their Food

Adding a splash of cool water directly to your dog’s raw meal can make food more appealing in hot weather while providing an easy hydration boost. Bone broth is another excellent option: it adds palatability, natural electrolytes, and encourages dogs who are being fussy to eat. Avoid adding warm water or serving food at room temperature on very hot days; a slightly chilled bowl can be more enticing.

Serve Raw Food Chilled

Serving food straight from the fridge, while it’s still cold, helps take some of the heat load off your dog and often makes mealtimes more appealing when appetite naturally dips in warmer weather. It also means the food spends less time sitting out at room temperature before it’s eaten, something worth being a little more mindful of with raw food in summer than at any other time of year.

Try Frozen Enrichment Treats

Frozen treats serve double duty in summer: they slow down eating, provide mental enrichment, and help cool your dog from the inside. A Kong filled with raw food and frozen, or an ice mould filled with bone broth and meat, are both simple options that most dogs find far more appealing than a standard bowl in the heat. If your dog is turning down meals but enthusiastically taking frozen treats, that tells you appetite is intact and it is the heat itself making mealtime less inviting.

Feed in a Cool, Shaded Area

Where your dog eats matters in summer. A hot conservatory, direct sunlight, or a stuffy kitchen can make mealtimes uncomfortable. Feeding in a cool, well-ventilated room or a shaded outdoor spot makes it much more likely your dog will settle and eat properly.

Offer Smaller, More Frequent Meals

If your dog is reluctant to eat a full portion in one sitting during summer, splitting their daily allowance into smaller meals can help. A smaller meal creates less digestive heat and is less demanding on a body that is already working to stay cool. Two or three smaller portions across the day, timed around cooler hours, is often more effective than two standard-sized meals.

Consider a Lighter Protein

Some dogs benefit from a lighter protein source during the hottest months. White fish or turkey tend to be easier to digest than heavier proteins like beef or lamb, and some dogs simply seem to find them more appealing when it is warm. This is not a hard rule, and most dogs do perfectly well on their usual protein in summer. But if your dog is consistently reluctant to eat and other adjustments have not helped, a temporary protein switch is worth trying.

Raw Dog Food in Summer: Does Your Dog Need Less?

One of the advantages of feeding raw dog food is how well it adapts to seasonal changes. Because raw food is biologically appropriate and naturally moisture-rich, it is easier to digest than ultra-processed alternatives, even when the body’s digestive resources are stretched by the heat.

That said, you may still notice your dog eating with less enthusiasm than usual. In most cases, reducing portions by around 10% during periods of lower activity is perfectly reasonable. You are not underfeeding; you are matching intake to output, which is exactly what smart nutrition looks like in practice.

The key is to keep an eye on your dog’s body condition rather than the clock or the calendar. A dog who is maintaining good muscle tone, energy levels, and stool quality is doing well, regardless of whether they are eating slightly less than usual.

How to Monitor Your Dog’s Body Condition in Summer

Summer is an ideal time to check in on your dog’s body condition score. Subtle weight changes can creep in when appetite and activity both shift at the same time. Run your hands along your dog’s ribcage: you should be able to feel the ribs easily but not see them prominently. If you can no longer feel them, they may be carrying a little extra weight. If the ribs are very prominent and the spine is visible, they may be losing condition.

For a clear, practical guide to assessing body condition at home, I recommend watching Dr Nick Thompson’s guide on YouTube, which walks through exactly what to look and feel for.

How to Check Your Dog’s Weight at Home – No Scales Needed

Supplements That Support Dogs in Hot Weather

For dogs that need a little extra support through summer, there are targeted dog supplements that are worth knowing about.

Panting causes dogs to lose vital minerals alongside moisture. Adding bone broth to meals or water is a simple way to replenish electrolytes naturally.

If your dog is prone to seasonal skin flare-ups ProDog’s Protect itch and allergy supplement can help with histamine responses during seasonal shifts, while Boost, multivitamin for dogs, provides broad nutritional coverage including antioxidant support.

For dogs prone to picking up passengers on summer walks, Repel is a natural tick and flea supplement.

These are additions, not necessities. A well-fed dog on a balanced raw diet is already well-positioned for summer. But if your dog has specific sensitivities or needs a seasonal boost, our nutrition team is always here to advise.

Discover our Bone Broth Range

Heatstroke in Dogs: Signs and What to Do

Reduced appetite in summer is usually harmless. Heatstroke is not. Knowing the difference between a dog who is a bit warm and one who is in genuine danger is one of the most important things a dog owner can know.

Heatstroke can develop quickly, especially in flat-faced breeds, overweight dogs, elderly dogs, and those exercised in direct sun. It is a life-threatening emergency.

Signs of Heatstroke

Contact your vet or an emergency animal hospital immediately if you notice any of the following:

Excessive, frantic panting that does not settle
Bright red or pale gums and tongue
Thick, sticky drooling
Rapid heart rate
Vomiting or diarrhoea, which may contain blood in severe cases
Muscle tremors or staggering
Confusion, weakness, or inability to stand
Seizures or loss of consciousness

excessive panting is a sign of heatstroke

What to Do If You Suspect Heatstroke

Act immediately and stay calm. The speed of your response matters.

Move your dog to a cool, shaded, well-ventilated area straight away.
Apply cool water to their body, particularly the neck, armpits, and groin. Do not place damp towels over your dog as this traps heat. Damp towels under them are fine.
Use a fan if available to help airflow over their damp coat.
Offer small amounts of cool water if they are conscious and able to swallow, but do not force it.
Call your vet or emergency animal hospital immediately and follow their guidance. Do not wait for your dog to improve before calling.

For further advice on how to keep your dog cool refer to our guide.

The RSPCA and PDSA both advise a “cool first, transport second” approach: begin cooling your dog at the scene while arranging veterinary care. Even if your dog appears to recover, a vet check is essential as internal organ damage may not be immediately visible. [6]

Supporting Your Dog Through the Warmer Months

Dogs are intuitive. When it is hot, they naturally slow down and eat less. That is not a problem to fix; it is biology doing exactly what it should. Your role is to tune in, make a few smart adjustments, and know when something has shifted from normal summer behaviour into something that needs attention.

A raw diet is one of the best foundations you can give your dog for navigating seasonal changes. The moisture content, digestibility, and nutritional integrity of fresh, species-appropriate food means your dog is already better equipped than most to handle what summer throws at them.

Travelling with your dog this summer? Our handy guide explains how to feed your dog while travelling.

If you would like tailored advice on your dog’s summer feeding routine, our expert nutrition team is on hand to help, free of charge. And if you are ready to explore raw dog food or dog supplements for the first time, we have everything you need to get started with confidence.

FAQs

Is it normal for dogs not to eat in hot weather?

Yes, it is very common. Dogs naturally eat less when temperatures rise because their metabolism slows, their energy needs decrease, and the body prioritises staying cool over digesting food. A mild reduction in appetite during warm weather is a normal physiological response, not a cause for concern on its own.

How long can a dog go without eating in hot weather?

A healthy adult dog can go 24 to 48 hours without eating without significant harm. Beyond that, it is worth contacting your vet, especially if the food refusal is accompanied by any other symptoms such as vomiting, lethargy, or changes in water intake.

Should I reduce my dog's portions in summer?

A reduction of around 10% during periods of lower activity is reasonable and often appropriate. The best guide is your dog’s body condition: if they are maintaining good muscle tone and a healthy weight, you are on the right track. If they are losing condition, adjust accordingly or speak to a nutritionist.

My dog is drinking but not eating. Is that normal?

Drinking while refusing food in hot weather is usually a sign that your dog is managing their temperature and hydration but has little appetite for solid food. This is typically heat-related and resolves as temperatures drop. If it continues beyond 48 hours or is accompanied by other symptoms, contact your vet.

Can hot weather cause inappetence in dogs?

Yes. Inappetence in dogs, meaning reduced or absent appetite, is one of the most common effects of hot weather. It is driven by a combination of thermoregulation demands, reduced activity levels, hormonal changes triggered by longer daylight hours, and the heat generated by digestion itself.

What foods should I avoid giving my dog in summer?

Keep grapes, raisins, corn on the cob, ice cream, human ice lollies (especially those containing xylitol), salted BBQ foods, onion, and cherries well away from your dog. Seasonal gatherings and BBQs bring a particular concentration of these hazards, so vigilance is especially important in summer.

What's the difference between heat-related appetite loss and heatstroke?

Heat-related appetite loss is gradual, mild, and follows the pattern of temperature changes. Your dog is otherwise alert, drinking, and behaving relatively normally. Heatstroke is an emergency characterised by frantic panting, red or pale gums, vomiting, tremors, collapse, and confusion. If you see those signs, cool your dog immediately and call a vet without delay.

How can I encourage my dog to eat in hot weather?

Shift mealtimes to the coolest parts of the day, add water or bone broth to their food, try frozen enrichment treats, feed in a cool shaded area, and consider offering slightly smaller portions more frequently. Most dogs respond well to one or more of these adjustments.

Does raw dog food help in summer?

Yes. Raw dog food is naturally moisture-rich and easier to digest than ultra-processed alternatives, which makes it particularly well-suited to summer feeding. Its high water content also contributes to hydration, which is especially valuable when dogs are panting more in the heat.

References

Durotoye, A.O. and Grayson, J. (1971) ‘Heat production in the gastro-intestinal tract of the dog’, Journal of Physiology, 214(3), pp. 417–426. doi: 10.1113/jphysiol.1971.sp009441.

Houpt, K. (1980) ‘What the technician should know about feeding behavior of dogs and cats’, Compendium on Continuing Education for the Animal Health Technician, 1, pp. 43–50.

Hazlerigg, D.G., Simonneaux, V., and Dardente, H. (2024) ‘Melatonin and seasonal synchrony in mammals’, Journal of Pineal Research, 76(5), e12996. Doi: 10.1111/jpi.12996

Nieminen, P., Mustonen, A.M., Asikainen, J. and Hyvärinen, H. (2002) ‘Seasonal weight regulation of the raccoon dog (Nyctereutes procyonoides): interactions between melatonin, leptin, ghrelin, and growth hormone’, Journal of Biological Rhythms, 17(2), pp. 155–163. doi: 10.1177/074873040201700206

Case, Linda P., Leighann Daristotle, Michael G. Hayek, and Melody Foess Raasch. Canine and Feline Nutrition: A Resource for Companion Animal Professionals. 3rd ed. Maryland Heights: Mosby Elsevier, 2011.

RSPCA (n.d.) ‘How to recognise and treat heatstroke in dogs’. Available at: https://www.rspca.org.uk/adviceandwelfare/pets/dogs/health/heatstroke. PDSA (n.d.) ‘Heatstroke in dogs’. Available at: https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub/conditions/heatstroke-in-dogs.

Dog Not Eating in Hot Weather? Why it Happens and What to Do

Blog in 60 Seconds

Is It Normal for Dogs to Lose Their Appetite in Hot Weather?