Kale has earned quite the reputation in human nutrition. It gets added to smoothies, salads and almost anything labelled “healthy” — so it is hardly surprising that dog owners are asking: can dogs eat kale too?

The short answer is yes, most healthy dogs can eat small amounts of kale.

But, as with most ingredients in canine nutrition, there is a little more to it than simply labelling something “good” or “bad” and just because your dog can eat something doesn’t mean they should.

Kale can provide fibre and a range of vitamins, minerals and naturally occurring plant compounds, but your dog doesn't need kale if they already eat a complete and balanced diet. It is an optional extra rather than an essential ingredient.

And if you do want to offer fresh kale, I would feed it cooked rather than raw.

Here’s why.

Is kale good for dogs?

Kale is a member of the cruciferous vegetable family alongside broccoli, cabbage, cauliflower and Brussels sprouts.

Nutritionally, kale provides:

• fibre

• vitamin K

• vitamin C

• carotenoids including beta-carotene

• calcium

• potassium

• naturally occurring antioxidants and plant compounds

Research also shows that kale contains a variety of prebiotic carbohydrates, although concentrations can vary significantly between different varieties and growing conditions.

That doesn't mean adding huge handfuls of kale to your dog's dinner will make them healthier.

If your dog eats a complete and balanced dog food, their nutritional requirements should already be provided by their main diet. Vegetables such as kale can simply add variety or be offered as part of their treat allowance.

More is not better.

Can dogs eat raw kale?

Technically, a small amount of raw kale is not considered toxic to a healthy dog. Veterinary guidance also recognises that dogs can eat small amounts of it.

However, raw isn't the way I would choose to feed kale.

Raw leafy vegetables have a tough fibrous structure that can be harder for some dogs to digest due to the walls of cellulose surrounding them. Cooking softens the plant material, making it easier for your dog to digest.

There is another interesting reason some dogs may struggle with vegetables such as kale: raffinose.

What is raffinose — and can it give dogs wind?

Raffinose is a type of carbohydrate belonging to a group called raffinose-family oligosaccharides, or RFOs.

Kale can contain raffinose, although the quantity varies enormously depending on the variety of kale and even the conditions in which it was grown.

Unlike simple sugars that can be readily absorbed, raffinose contains bonds that mammals don't efficiently digest within the small intestine.

Instead, these carbohydrates reach the large intestine where bacteria ferment them.

And fermentation produces gas.

Research into raffinose-family oligosaccharides shows that this bacterial fermentation can produce gases including hydrogen, carbon dioxide and methane. In some animals, larger quantities can therefore contribute to wind, abdominal rumbling, bloating or looser stools.

Sound familiar after eating too many Brussels sprouts?

It's a similar principle.

This doesn't make raffinose dangerous. In fact, fermentable carbohydrates can also interact beneficially with the gut microbiome.

It's the dose and the individual dog that matter.

That's another reason I wouldn't put a big handful of raw kale into your dog's bowl simply because you've heard vegetables are healthy.

How should you cook kale for dogs?

If you're offering fresh kale to your dog, keep things simple.

Wash it thoroughly, remove particularly thick stalks and steam or gently boil the leaves until softened.

Once cooked:

1. Allow it to cool.

2. Finely chop or mash it.

3. Start with a very small amount mixed into your dog's normal food.

4. Monitor their stools and digestion before offering it again.

Don't cook kale with butter, oils, salt, stock cubes, garlic, onion, sauces or seasoning.

Cooking doesn't magically remove every fermentable carbohydrate from kale, but it does soften the vegetable considerably and generally makes it easier to incorporate into the diet than feeding tough raw leaves.

How much kale can dogs eat?

This is where we need to get away from the idea that if a little is good, a lot must be better.

A teaspoon of cooked kale mixed into dinner is very different from replacing 20% of your dog's balanced food with vegetables.

If your dog eats a complete diet, extras and treats should generally account for no more than around 10% of their daily calories so they don't start displacing important nutrients from their main food. This is also the guideline recommended by the WSAVA Global Nutrition Committee.

For fresh kale, start small.

A little finely chopped cooked kale occasionally is plenty.

Which dogs shouldn't eat kale?

Kale can be perfectly suitable for many dogs, but it isn't appropriate for every individual.

Dogs with sensitive digestion

If your dog already experiences excessive wind, bloating, diarrhoea or digestive discomfort, suddenly adding lots of fibrous vegetables isn't necessarily helpful.

Introduce any new ingredient gradually and stop if symptoms worsen.

Dogs with calcium oxalate urinary stones

This is an important one.

Kale contains oxalates, so I wouldn't casually add it to the diet of a dog with a history of calcium oxalate bladder or kidney stones.

Dogs with calcium oxalate urolithiasis are commonly managed with very specific therapeutic diets, and adding foods or treats outside that dietary plan can interfere with what we're trying to achieve nutritionally. Veterinary guidance recommends particular care with additional foods in dogs prone to calcium oxalate stones.

Dogs eating a veterinary prescription diet

If your dog has kidney disease, urinary disease or another condition requiring a carefully controlled prescription diet, don't automatically add kale—or any other ingredient—because you've read that it's healthy.

Check with your vet or veterinary nutrition professional first.

Dogs completing an elimination diet

If you're investigating a possible adverse food reaction, adding random vegetables, chews or treats can make the results impossible to interpret.

Stick to the elimination diet you've been given until the trial is complete.

Are kale dog treats different from feeding raw kale?

Yes.

There is a big difference between throwing several raw kale leaves into your dog's dinner and giving a formulated treat containing a controlled amount of kale as one component of the recipe.

For example, Soopa Kale & Apple Healthy Bites contain 2% kale powder, alongside ingredients including apple, potato, chickpea, tapioca and seaweed. Each Healthy Bite contains approximately 3 calories, which makes portioning treats much easier.

Soopa also makes Kale & Apple Dental Sticks for dogs who prefer a longer-lasting chew.

If your dog tolerates kale and you're looking for an easy way to include it without preparing vegetables yourself, these can be a convenient option.

So, can dogs eat kale?

Yes — most healthy dogs can eat kale in moderation.

But don't fall into the trap of believing that because kale is nutrient-rich, your dog needs a huge amount of it.

If you're adding fresh kale at home, cook it, keep portions small and introduce it gradually.

Raw kale isn't inherently poisonous, but its fibrous structure and fermentable carbohydrates such as raffinose mean it can cause digestive upset in some dogs, particularly when fed in larger quantities.

And remember: your dog's diet doesn't become healthier simply because we keep adding ingredients to it.

A well-formulated complete diet should do all the nutritional heavy lifting.

Everything else—including kale—is just the nice added extra.