Can Weather Changes Affect Your Dog’s Digestion?

Changes in the weather can influence a dog’s appetite, activity, sleep, stress levels and daily routine. These changes may affect digestive comfort and stool quality, but current evidence does not show that ordinary fluctuations in temperature, humidity or air pressure directly reshape a healthy dog’s gut microbiome.

The most useful approach is therefore to consider how weather changes a dog’s behaviour, feeding routine, hydration and environmental exposure.

Does Weather Directly Affect a Dog’s Gut Microbiome?

The canine gut microbiome is a complex community of microorganisms involved in digestion, metabolism and communication with the immune and nervous systems. Its composition can be influenced by factors including diet, gastrointestinal disease, medication and the individual dog (1).

Research directly connecting everyday weather changes with alterations in the canine gut microbiome remains limited. However, there is evidence that weather can change a dog’s behaviour and routine.

A University of Milan study collected owner-reported information about 392 dogs. In the survey, 65.3% of owners believed that weather events affected their dog’s behaviour. Temperature changes and thunderstorms were associated with differences in activity, play, sleep and aspects of daily management (2). The study examined behaviour rather than the gut microbiome, so it should not be interpreted as evidence that weather directly causes microbial or digestive changes.

How Weather Can Influence a Dog’s Digestion Indirectly

Hot Weather, Appetite and Hydration

Dogs may be less active during hot weather and some may eat at different times or show less interest in food. Changes in activity, feeding times and water intake can all affect a dog’s normal digestive routine.

Make sure fresh water is always available, move exercise to cooler parts of the day and avoid making unnecessary changes to the dog’s usual food. Any diet change should be introduced gradually.

Heavy panting, excessive drooling, vomiting, diarrhoea, weakness, confusion or collapse can indicate heatstroke and require urgent veterinary attention (3).

Thunderstorms and Changes in Routine

Thunderstorms and other intense weather events can affect some dogs’ behaviour. A worried dog may eat less, refuse a meal, receive more treats than usual or become reluctant to go outside. These changes can disrupt an otherwise consistent feeding and toileting routine.

Keeping meals, walks and resting periods as predictable as possible may help. Dogs with significant noise sensitivity or storm-related anxiety should be supported with advice from a veterinarian or qualified clinical animal behaviourist.

You can also read more about communication between the digestive and nervous systems in our guide to the gut-brain axis in dogs.

Cold or Wet Weather and Reduced Activity

Cold, rain and shorter daylight hours may lead to shorter walks and more time indoors. Owners may also change feeding quantities, offer additional treats or alter meal times when routines change.

There is no strong evidence that a rainy day directly disrupts the gut microbiome. However, changes in activity, food intake and routine may coincide with changes in appetite, bowel habits or stool quality in an individual dog.

Outdoor Water and Food Storage

Puddles, standing water and unfamiliar outdoor water sources may contain microorganisms, parasites or other contaminants. Dogs should be offered clean drinking water and discouraged from drinking from questionable outdoor sources.

Warm or humid conditions can also affect food storage. Keep dry food and treats sealed, cool and dry, and discard anything that has become damp, mouldy or contaminated.

A Practical Seasonal Digestive-Health Checklist

• Keep the dog’s normal diet and meal times as consistent as possible.
• Introduce any necessary food changes gradually.
• Provide constant access to clean, fresh water.
• Adjust exercise safely for the temperature without removing activity altogether.
• Avoid stagnant water and follow any local water-quality warnings.
• Store food in a cool, dry place and check it regularly for spoilage.
• Monitor appetite, stool quality, vomiting, energy and drinking habits.

Persistent diarrhoea or vomiting, blood in the stool, abdominal pain, marked lethargy, dehydration or a sustained loss of appetite should be discussed promptly with a veterinarian.

Where CaniNectar Fits

CaniNectar is a complementary feed designed to support digestion alongside a dog’s existing food. It contains Enzyme Rich Malt Extract with naturally occurring enzyme activity, including amylase, protease and lipase, which are relevant to the digestion of carbohydrates, proteins and fats.

In a four-week exploratory study involving nine UK Border Force dogs, five received improved stool-quality ratings and four received improved appetite ratings. Faecal analysis also identified changes in several bacterial genera during the study period (4). The study was small and uncontrolled, so its findings should be viewed as exploratory.

CaniNectar is not a treatment for heatstroke, contaminated water, infection or other weather-related illness. Its practical role is to provide consistent digestive support without requiring owners to replace a complete diet that already suits their dog.

Further information about the product and supporting research is available through the CaniNectar product page and the CaniNectar Science Hub.

The Bottom Line

Weather can affect a dog’s behaviour, activity, appetite and daily routine. These indirect changes may influence digestive comfort, but there is currently limited evidence that normal weather fluctuations directly alter the gut microbiome of healthy dogs.

Maintaining a consistent diet, providing clean water, adapting exercise safely and monitoring changes in appetite and stool quality are the most useful steps owners can take throughout the year.

References

1. Pilla, R., and Suchodolski, J. S. (2020). The Role of the Canine Gut Microbiome and Metabolome in Health and Gastrointestinal Disease. Frontiers in Veterinary Science, 6, 498. View study.
2. Palestrini, C., Minozzi, G., Mazzola, S. M., Lopez, A., and Cannas, S. (2022). Do intense weather events influence dogs’ and cats’ behavior? Analysis of owner reported data in Italy. Frontiers in Veterinary Science, 9, 973574. View study.
3. Cornell University College of Veterinary Medicine. Heatstroke: A Medical Emergency. View veterinary guidance.
4. Mager, L. (2023). Exploratory Analysis of CaniNectar Autumn 2023 Review (unpublished). View report.