Small, sweet, and packed with nutrients, blueberries have earned their ‘superfood’ status in the human diet, but what about for our dogs? Are they truly beneficial, or is the hype more about trend than science? Let’s take a closer look.
Antioxidant powerhouses
Blueberries are rich in antioxidants, especially anthocyanins, which are the pigments responsible for their deep blue colour. Antioxidants help neutralise free radicals, unstable molecules that can damage cells and contribute to chronic diseases and ageing.
In dogs, oxidative stress has been linked to cognitive decline, inflammatory conditions, and joint degeneration. Research from the Journal of Animal Science (2012) found that older dogs fed an antioxidant-rich diet (including blueberries) showed improved cognitive function compared to a control group. Another study in Applied Animal Behaviour Science (2017) suggested that antioxidant supplementation may enhance learning and memory in senior dogs.
While the exact dose of antioxidants required for canine health is not yet firmly established, blueberries offer a natural, whole-food source that can be a useful addition to a balanced diet.
Nutritional profile and sugar content
Per 100 g, blueberries contain:
- Calories: ~57 kcal
- Carbohydrates: ~14 g (of which ~10 g are natural sugars)
- Fibre: ~2.4 g
- Vitamin C: ~9.7 mg
- Vitamin K: ~19.3 µg
- Manganese: ~0.3 mg
For most healthy dogs, this sugar content is minimal when blueberries are given in moderation. However, dogs with diabetes, obesity, or certain metabolic disorders should have their fruit intake carefully monitored. The fibre content is a plus, supporting healthy digestion, but overfeeding can cause loose stools.
Top tip
Serve fresh or frozen (dogs often love them as crunchy summer snacks).
Safe feeding amounts
For healthy, active dogs, blueberries can be given as a treat or mixed into meals. As a guide:
- Small dogs (under 10 kg): Two to four blueberries, a few times per week
- Medium dogs (10–25 kg): Four to six blueberries
- Large dogs (25 kg+): Six to eight blueberries
These amounts help limit excess sugar while still providing antioxidants and fibre. Always introduce new foods gradually, and watch for signs of digestive upset or allergic reaction (rare, but possible).
Top tip
Avoid blueberries coated in sugar or included in sweetened baked goods.
The verdict
Blueberries aren’t a magic bullet, but they’re a safe, nutrient-dense addition to most dogs’ diets. Their antioxidants may help support cognitive function and overall health, especially in ageing dogs, while their low calorie density makes them a guilt-free treat option.
As with all treats, moderation is key, and they should complement, not replace, a balanced, complete canine diet.
References:
- Milgram, N.W., et al. (2005). Cognitive function in aged dogs: antioxidants, mitochondrial cofactors, and behavioural enrichment. Neurobiology of Ageing, 26(1), 77–90.
- Pan, Y., et al. (2010). Dietary supplementation with antioxidants improves learning in aged dogs. Journal of Animal Science, 88(1), 172–179.
- Zanghi, B.M., & Cupp, C.J. (2017). Dietary interventions for cognitive ageing in dogs. Applied Animal Behaviour Science, 189, 86–93.
