How Much Should I Feed My Dog in Hot Weather?
At a glance
- Most dogs eat 10–20% less in hot weather — this is a normal physiological response to heat
- Reduced exercise means lower calorie needs, so portion sizes should reflect activity level, not just habit
- Fresh water is more important than any food adjustment — dogs need significantly more water in summer
- Feeding in the cooler parts of the day (morning and evening) improves appetite and reduces digestive stress
- Rapid weight loss, complete food refusal, or signs of heatstroke require immediate vet attention
Does hot weather actually change how much my dog needs to eat?
Yes — most dogs genuinely need fewer calories in summer. The reason is straightforward: when your dog is less active due to heat, they burn less energy. Combine that with the fact that the body naturally suppresses appetite when it is warm, and you have a recipe for smaller meals across the board.
Most dogs eat 10–20% less during a heatwave. That is not a feeding problem. It is the body doing exactly what it should. The mistake most owners make is continuing to serve the same portion they use in winter, then worrying when the bowl is not empty.
The clearest guide is body condition. Run your hands along your dog's ribs. You should feel them easily without pressing hard, but not see them clearly. If your dog is maintaining that condition on slightly reduced portions, you are in the right place. General guidance on feeding across all life stages explains how to assess body condition in more detail.
How should I adjust my dog's portions when it gets hot?
Start by tracking how much your dog actually eats over three to four days during a warm spell, then compare that to their normal intake. If they are consistently leaving 10–15% of their meal, reduce the portion accordingly. Do not force them to eat the same amount as usual.
Activity level is the most reliable adjustment trigger. A dog who normally gets an hour of walking but is only managing a gentle 20-minute stroll in the shade needs noticeably fewer calories. A working dog or one with a very active summer routine may need no reduction at all.
These are the practical adjustments most owners find useful in summer:
- Reduce portion size by 10–15% during hot spells and restore it when temperatures drop
- Feed twice a day rather than once — smaller meals are easier to digest in heat
- Serve meals in the morning and evening, when temperatures are lowest
- Never feed immediately after exercise, even a short walk in warm weather
- Refrigerate or store food correctly — fresh food left in a warm bowl becomes unappetising and unsafe
For dogs on fresh food like Sassy Salmon, always follow storage instructions. Marleybones Pantry Fresh meals are slow-cooked in-pack and shelf-stable without refrigeration until opened, which makes them easier to portion and store than frozen alternatives during summer.
Why is water more important than food in hot weather?
Dehydration is a far bigger risk than under-eating in hot weather. Dogs regulate body temperature primarily through panting, which loses significant moisture with every breath. A dog who is panting heavily on a warm day can lose more water in an hour than they might drink voluntarily.
The general guideline is 50–60ml of water per kilogram of body weight per day. In hot weather that rises. A 20kg dog might need over 1.5 litres on a warm day, compared to around 1 litre on a cool one. Always offer water before and after meals, not just alongside them.
Food moisture content matters here too. Dry kibble contains roughly 8–10% moisture. Fresh and wet foods contain 70–80%. A dog eating fresh food is taking in meaningful hydration with every meal, which contributes to their overall fluid intake in a way that kibble simply cannot match.
What signs should I watch for when feeding my dog in summer?
A modest reduction in appetite is normal. The following signs are not normal and need a vet assessment promptly:
- Complete refusal to eat for more than 24 hours
- Vomiting after meals, especially in the heat of the day
- Excessive lethargy beyond the usual summer laziness
- Rapid, unexplained weight loss over a week or two
- Signs of heatstroke: excessive panting, drooling, red gums, collapse
Heatstroke is a genuine emergency. If you suspect it, move your dog to a cool area, apply cool (not cold) water to their body, and contact a vet immediately. Do not wait to see if they improve on their own.
If your dog has a health condition that affects their appetite or metabolism, such as hypothyroidism or Cushing's disease, summer feeding adjustments are worth discussing with your vet directly. Changes in food intake can sometimes mask underlying issues in dogs with these conditions.
Every dog is different — build your personalised Marleybones feeding and health plan tailored to your dog's age, size, and health requirements.
For dogs who are already picky eaters, heat makes the problem worse. Appetite is even more easily suppressed when temperatures climb. Feeding a fussy eater in the UK covers practical strategies that work year-round, but the advice applies especially in summer.
“Such a relief to see her enjoying her food”
Frequently asked questions
Should I feed my dog less in summer?
Most dogs benefit from a small reduction in portions during hot weather, roughly 10–15%, particularly if their exercise has decreased. Use body condition rather than a fixed rule: if your dog is maintaining a healthy weight on slightly less food, that is the right amount.
What time of day should I feed my dog in hot weather?
Feed in the morning and evening when temperatures are at their lowest. Avoid feeding around midday or in the heat of the afternoon. Never feed your dog immediately after exercise in warm weather — wait at least 30 minutes.
Is it normal for dogs to drink more water in summer?
Yes. Dogs pant to cool down, and panting loses moisture rapidly. Water intake can increase by 30–50% in warm weather. Always provide fresh water in a shaded location, and refresh it frequently so it stays cool.
Can hot weather cause my dog to vomit after eating?
Eating a large meal quickly in hot conditions can cause vomiting. Serve smaller, more frequent meals, avoid feeding in direct sunlight, and ensure your dog rests after eating. Repeated vomiting or any sign of bloating, especially in large breeds, requires immediate vet attention.
Does fresh dog food help in summer?
Fresh food has a moisture content of around 70–80%, compared to 8–10% in dry kibble. That additional hydration supports fluid intake at a time when dogs are losing more moisture through panting. It is also more palatable for dogs whose appetite dips in the heat.
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