Are blueberries good for dogs?

One blueberry has less than 1 calorie, and 100 g (about two thirds of a cup) holds roughly 57 calories. That makes them useful for dogs on a diet who still enjoy a reward. A small dog can have 5 to 8 berries, a medium dog 10 to 20, and a large dog a small handful of around 25.

Very large portions can cause loose stools, so build up gradually.

Because they are bite-sized, blueberries work well for recall practice and trick training when you want many small rewards without piling on calories. Frozen berries rolled across the floor turn into a short chasing game for playful dogs.

For very small dogs or fast gulpers, halving each berry removes any choking concern.

For a 25 kg (55 lb) dog on a diet, swapping two biscuit treats for 20 blueberries can save around 50 calories a day, which adds up over a month.

Blueberry muffins, pies, jams and yogurts add sugar, fat and sometimes sweeteners such as xylitol, which is dangerous to dogs. Dried blueberries are often coated in sugar. Stick with plain fresh or frozen berries, washed first.

Supermarket blueberries and frozen bags are equally fine; frozen berries are often cheaper out of season. Wild bilberries and blueberries on heathland walks are the same family and safe in small amounts, but make sure your dog is not also eating unknown berries growing nearby. Wash shop-bought berries to remove surface residue before sharing.