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Yes — blackberries are safe for dogs in small amounts, and they are one of the better fruits to share. High in fibre, low in sugar, soft enough to need no preparation.
Before you share any of it
The two things worth knowing are both about context rather than the fruit: a dog grazing a wild bramble hedge is a different situation from a dog eating berries out of a punnet, and the identification problem with wild berries is where real harm comes from.
Is blackberry good for dogs?
Anthocyanins
The deep purple-black colour is anthocyanin pigment, and blackberries are one of the richest common sources. These are the same class of antioxidant compounds that make blueberries worth eating.
High fibre, low sugar
About 8 grams of fibre and 7 grams of sugar a cup. Alongside raspberries, that ratio is the best of any fruit a dog is likely to be offered.
Vitamins C and K, and manganese
All present in genuinely useful amounts. Vitamin K is involved in clotting and bone metabolism.
Low calorie
Around 62 calories a cup, and a dog-sized portion is a fraction of that.
Honest limitation
Blackberries contain trace amounts of xylitol, as raspberries do — in quantities far too small to matter at any realistic portion, but a reason to count berries out rather than leave a punnet within reach. They are also high enough in fibre that a generous handful loosens stools.
How many blackberries can a dog eat?
| Dog size | Approximate weight | Fresh blackberries per day |
|---|---|---|
| Toy | Under 10 lbs | 1 to 2 berries |
| Small | 10 to 20 lbs | 2 to 3 berries |
| Medium | 20 to 50 lbs | 4 to 6 berries |
| Large | 50 to 90 lbs | Up to 8 berries |
| Giant | Over 90 lbs | A small handful |
Two or three times a week is sensible. The limit is the fibre rather than anything dangerous — a dog who eats a punnet will have an uncomfortable day rather than an emergency.
How to serve blackberries
- Wash them well. Soft fruit is commonly sprayed, and blackberries are never peeled.
- Fresh and whole is fine. They are soft enough not to be a choking risk.
- Halve them for a toy breed if you prefer.
- Frozen berries are a good hot-weather treat and keep their nutrients.
- Mashed through food works for a fussy dog.
- Start with one berry and see how their stomach handles it.
- Count them out instead of offering the container.
Wild brambles: the part worth thinking about
Plenty of dogs will graze a hedgerow in late summer, and most of the time that is harmless — wild blackberries are the same fruit as shop-bought ones. Three things make it worth some attention.
Identification. This is the real hazard. Hedgerows contain berries that are not blackberries, and some are genuinely dangerous: deadly nightshade, black bryony, privet, holly, yew, pokeweed and elderberry (raw) among them. A dog does not discriminate. If your dog has eaten an unidentified wild berry and is vomiting, drooling, unsteady, lethargic or having tremors, call your vet immediately and take a photograph or sample of the plant with you.
Quantity. A dog with free access to a productive bramble will keep eating, and several cups of blackberries means a day of diarrhoea.
Thorns and pesticides. Bramble thorns cause mouth and paw injuries, and hedgerows along field margins and roadsides are often sprayed or contaminated.
So: wild blackberries off a bramble you can identify, in small amounts, are fine. A dog grazing unsupervised in a hedgerow is not something to encourage.
What to avoid
- Unidentified wild berries. Covered above, and the only genuinely dangerous version of this question.
- Grapes, which are not berries in the shopping sense but get confused with them. Grapes and raisins cause acute kidney injury in dogs with no established safe amount, and the ASPCA treats any quantity as a reason to call. This is the most important line on the page.
- Blackberry jam, pie and crumble. Sugar, fat and pastry.
- Anything sugar-free with blackberry flavour. Added xylitol in manufactured products is dangerous at low doses, unlike the trace amount in the fruit itself.
- Tinned berries in syrup.
- Mouldy or fermenting berries. Blackberries turn quickly. Bin them.
- A whole punnet. Portion them.
Which dogs should be careful
- Dogs with sensitive stomachs. 8 grams of fibre a cup. Start with one berry.
- Dogs on blood-thinning medication. Blackberries are a reasonable source of vitamin K, which is directly involved in clotting. Mention it to your vet.
- Dogs with kidney or bladder stone history. Blackberries contain oxalates — worth raising with your vet rather than guessing.
- Diabetic dogs. Blackberries are among the better fruit options because of the low sugar, but any fruit needs clearing first.
- Puppies. A berry or two from around 12 weeks, occasionally.
One cosmetic thing to expect: dark purple staining on the muzzle and in the stool. Harmless, and it washes off — though it does catch owners out, because very dark stool can also be a sign of digested blood. If your dog has not had berries and the stool is black and tarry, that is a reason to call your vet rather than something to wait out. With a muzzle full of blackberry juice, it is just blackberries.
A treat that needs no counting
Blackberries are a genuinely good fruit for dogs and a pleasant thing to share on a late-summer walk. They are also seasonal, easy to over-give, and best portioned by hand.
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Shop Hemp Dog Treats →Frequently asked questions
How many blackberries can a dog eat?
Two to three for a small dog, four to six for a medium dog, up to eight for a large dog, and one or two for anything under 10 lbs. Two or three times a week rather than daily, because of the fibre.
Which berries are toxic to dogs?
Grapes are the critical one — acute kidney injury with no established safe amount, so any quantity means calling your vet. Among wild and ornamental plants, avoid deadly nightshade, black bryony, privet, holly, mistletoe, yew, pokeweed, juniper and raw elderberry. Blackberries, blueberries, raspberries and strawberries are all safe in small amounts.
What fruits can dogs not have?
Grapes and raisins, in any amount. Then the pits and stones of cherries, peaches, plums and apricots, persimmon seeds, and avocado pit and skin. Everything else common is a portion question rather than a safety one.
Can dogs eat wild blackberries?
Yes, if you are certain what they are and the quantity is small. The real risk is a dog grazing a hedgerow unsupervised and eating something that is not a blackberry — several hedgerow berries are genuinely dangerous. Thorns and roadside spraying are the other two reasons to supervise.
Do blackberries contain xylitol?
Trace amounts, naturally, as raspberries do — far too little to matter at any realistic portion. The xylitol to worry about is the added kind in sugar-free gum, mints and some peanut butters, which is dangerous to dogs at low doses.
Can dogs eat frozen blackberries?
Yes. Plain frozen berries are a good hot-weather treat. Not frozen in syrup or as part of a sweetened mix.
Will blackberries upset my dog's stomach?
A few will not. A lot will, because of the fibre — loose stools are the usual result of a dog finding a productive bramble.
Are blackberries better than blueberries for dogs?
They are close. Blackberries have more fibre and vitamin K; blueberries are slightly easier to portion and marginally lower in sugar. Either is a good choice. Our blueberry guide covers that one in full.
Can cats eat blackberries?
A small piece is harmless, but cats cannot taste sweetness and gain nothing from fruit. Our cat safety guide has the detail.
The bottom line
Blackberries are safe and genuinely useful for dogs in small amounts — high in fibre and anthocyanins, low in sugar, and soft enough that a wash is the only preparation needed. Count out a few rather than handing over the punnet, and be more careful about a dog grazing a hedgerow than about the fruit itself, because the berry you cannot identify is the one that causes harm.
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Shop Hemp Seed Oil →Written by Marc Brannigan, Co-Founder & CEO of HempMy Pet. Marc founded HempMy Pet in 2016 and built it into a vertically integrated, seed-to-sale organic hemp company — breeding its own hemp genetics, growing them on our own farm in Longmont, Colorado using organic growing practices, and formulating every product in-house. The company has spent nearly a decade formulating hemp products for dogs, cats, and horses and commissioned HempMy Pet’s two university clinical trials.
This article is for general educational purposes and is not a substitute for veterinary advice. Hemp/CBD products are supplements intended to support normal structure and function; they are not intended to diagnose, treat, cure, or prevent any disease. Always consult your veterinarian before changing your pet’s diet, especially if your pet is pregnant, nursing, on medication, or has a health condition.
Sources: ASPCA Animal Poison Control; general veterinary nutrition guidance.
