Can Dogs Eat Watermelon? Rind, Seeds and Serving Sizes

By Marc Brannigan, Co-Founder & CEO

Yes — the pink flesh is one of the best hot-weather treats there is. The rind and the seeds are not. Watermelon is 92% water, which is the whole point of it: it is the rare treat that actively helps a dog take on fluid on a hot day, at around 46 calories a cup.

Why the rind and seeds matter

The rind

Watermelon rind is not toxic, but it is tough, fibrous and almost impossible for a dog to chew down into anything swallowable. Dogs who get hold of a rind tend to gulp chunks, and those chunks cause vomiting or lodge in the gut. Intestinal blockage is a surgical emergency, and watermelon rind is a well-known cause of it in summer. The pale green and white part counts as rind too, not just the dark skin.

If your dog has eaten rind, watch closely for 48 hours. Repeated vomiting, straining without producing stool, refusing food, a tense or painful belly, or obvious discomfort all mean call your vet — and with a small dog, call sooner.

The seeds

Black watermelon seeds contain no meaningful toxin. A couple swallowed by a big dog will pass. The problem is volume and size: a mouthful of seeds in a small dog can clump and obstruct. Seedless watermelon solves this entirely, and the white immature seeds in seedless varieties are soft and harmless.

Is watermelon good for dogs?

Hydration

The real benefit, and a genuine one. On a hot day, or after a long walk, watermelon gets water into a dog who will not drink from a bowl. It is not a substitute for water, and it is not a fix for heat stroke — a dog showing heavy panting, bright red gums, wobbliness or collapse needs a vet immediately, not fruit. But as everyday warm-weather support it works well. For dogs who lose a lot through panting and exertion, electrolytes are the related topic worth reading.

Vitamins A, B6 and C

All present in useful amounts. Vitamin A supports vision and skin; B6 is involved in protein metabolism.

Lycopene

Watermelon is one of the better sources of lycopene, the carotenoid that makes it pink. It is an antioxidant, and the same compound that makes orange and red vegetables worth feeding.

Very low calorie

46 calories a cup, almost no fat. For an overweight dog, watermelon is one of the most generous-looking treats you can give for the least calorie cost.

How much watermelon can a dog eat?

Dog size	Approximate weight	Seedless flesh per day
Toy	Under 10 lbs	1 to 2 small cubes
Small	10 to 20 lbs	2 to 3 cubes
Medium	20 to 50 lbs	About half a cup, diced
Large	50 to 90 lbs	About one cup, diced
Giant	Over 90 lbs	Up to one and a half cups

Because it is so watery, the main consequence of overdoing watermelon is not calories — it is a dog who needs to go out urgently, and loose stools. Keep the first serving small and see how they handle it.

How to serve watermelon

• Buy seedless if you can. It removes the whole seed question.
• Cut all rind away — the dark skin and the pale layer under it.
• Dice into cubes sized for the dog. Small dice for anything under 20 lbs.
• Freeze cubes for a hot afternoon. Frozen watermelon is softer than frozen berries and works well for seniors.
• Blend and freeze in a toy — pureed watermelon in a rubber chew toy, frozen solid, is twenty minutes of entertainment for almost no calories.
• Never feed a whole slice with the rind on and leave the dog to it. That is how the rind gets eaten.

What to avoid

• The rind, in any form. Including pickled rind.
• Watermelon-flavoured anything. Sweets, drinks, ice pops, chewing gum. Gum and sugar-free products are a xylitol risk, which is dangerous to dogs in small amounts.
• Shop-bought watermelon juice. Usually sweetened, and the fibre is gone.
• Watermelon left out in the heat. Cut melon sours quickly and grows bacteria fast. If you would not eat it, do not give it to the dog.
• Alcoholic watermelon anything. Worth saying because watermelon turns up in summer cocktails and dogs drink out of cups left on patio tables. Alcohol is toxic to dogs.

Which dogs should be careful

• Diabetic dogs. Watermelon has a high glycaemic index despite being low in total sugar per serving, because there is so much water. Ask your vet before including it.
• Dogs with kidney disease. The fluid and mineral load matters in these dogs. Vet first.
• Dogs with loose stools or sensitive guts. Start with a single cube.
• Dogs who gulp. Dice small. A cube of melon is slippery.
• Puppies. Small amounts of diced seedless flesh from about 12 weeks.

Beyond fruit, for the hot months

Watermelon is a good tool for a hot day, but the dogs who struggle most in summer — the anxious travellers, the ones who pant through a thunderstorm, the seniors who stiffen up after a walk in the heat — need more than hydration.

Our organic hemp dog treats come in a small-dog and a large-dog size, baked in Colorado with organic ingredients and full-spectrum hemp extract. For dogs who do better with an oil, the hemp seed oil range is the alternative, and our serving guide gives amounts by body weight.

Frequently asked questions

The bottom line

Seedless watermelon flesh, rind removed and diced to size, is one of the best summer treats you can give a dog — hydrating, low calorie, and something most dogs take happily. The rind is the real hazard and the reason never to hand over a whole slice. Keep to the amounts in the table, go small the first time, and keep watermelon-flavoured products and anything sugar-free well away.