Can Dogs Eat Zucchini? Yes, Unless That Zucchini Tastes Bitter

Can dogs eat zucchini? Yes. Plain raw or cooked zucchini, skin and seeds included, is safe for most dogs in small pieces, and it’s mostly water. The one zucchini to keep out of the bowl is a bitter one, since bitterness means toxic compounds called cucurbitacins.

That last part is the step most feeding advice skips, and it’s the only one that needs you rather than your dog. The rest is simple: no seasoning, small pieces, and a modest amount.

Is zucchini good for dogs?

Zucchini is a good low-calorie treat for dogs, because 100 grams of raw zucchini with the skin holds just 17 calories and is about 95% water, according to USDA FoodData Central.

A single slice comes to roughly 1.7 calories, which makes it one of the lightest things you can hand a begging dog.

It also carries some fiber, potassium and vitamin C, but a dog eating a complete and balanced food already gets those, so zucchini earns its place as a swap for heavier treats.

That swap matters more with a dachshund than with most breeds. My Bruno was nearly 40% overweight before his vet moved him onto Hill’s w/d, and extra weight is the last thing you want on a long back.

If you’re working on your own dog’s waistline, feeding an overweight dachshund walks through the bigger changes, which matter far more than any single vegetable.

The one zucchini your dog shouldn’t eat: a bitter one

A zucchini that tastes bitter isn’t safe for your dog or for you. Bitterness comes from cucurbitacins, natural compounds that wild gourds carry in high amounts, and a strongly bitter zucchini can cause vomiting, cramps and diarrhea that last for days.

Most of the time the bitterness is mild. Sarah Browning of Nebraska Extension explains that heat, wide temperature swings or too little water can make zucchini a little bitter.

The severe kind is genetic. It comes from a single dominant gene picked up when bees cross a crop with wild gourds, and it shows up in plants grown from that seed, which is why it can hit one plant and spare its neighbors. She describes a Nebraska garden where 1 of 12 zucchini plants from the same seed packet produced very bitter fruit, even though all twelve shared the same bed and the same watering.

In the Australian cases she cites, about 3 grams of bitter zucchini was enough to make people ill.

Don’t assume a supermarket zucchini is exempt. French Poison Control Centers logged 353 people who ate inedible, bitter squash between 2012 and 2016 (Le Roux et al., Clinical Toxicology). In 55.8% of those cases the squash came from a store, and in 25.5% it came from a garden.

Most of those patients had vomiting, diarrhea or stomach pain, and none died. A German case report from 2020 describes a 66-year-old woman who developed bloody diarrhea and colitis after eating bitter zucchini, then recovered on IV fluids within two days.

What about dogs? I couldn’t find a single published case of cucurbitacin poisoning in a dog. That’s a gap.

It doesn’t make dogs immune. A 2022 lab study funded by Mars Petcare found that one of the dog’s bitter taste receptors reacts to cucurbitacin B in cells, so your dog can probably taste it, but nobody has tested whether a hungry dachshund would actually spit out a bitter piece.

So the taste falls to you. Before you share, take a tiny nibble of raw zucchini from the end you’re cutting and spit it out. If it’s sharply bitter, the whole zucchini goes in the trash, and if it came from your garden, don’t save seed from that plant.

If your dog has already eaten some of a bitter one and starts vomiting or has diarrhea, especially with blood in it, call your vet and say what it ate.

Can dogs eat zucchini raw or cooked?

Dogs can eat raw zucchini, and they can eat it steamed, boiled or roasted, as long as it’s plain. The American Kennel Club says plain raw, steamed or cooked zucchini is safe, while oil, salt, seasoning, garlic and onion are not.

You don’t need to peel it or scoop out the seeds, since both are soft. Raw pieces are crunchy, though, and a big chunk is a choking risk for a small dog that gulps. Grate raw zucchini over the food, or cut it into thin coins and then into quarters. Steaming softens it for a senior dog or one with missing teeth.

Wash it first, and set the dog’s share aside before anything else goes in the pan. Butter and oil aren’t toxic, but PetMD notes that rich fats can upset a dog’s stomach and may trigger pancreatitis.

How much zucchini can a dachshund have?

Start with one or two thin slices, and keep all treats, zucchini included, under 10% of your dog’s daily calories. Purina, the AKC, Chewy and PetMD all give that same 10% limit. With zucchini, though, you’ll run out of stomach long before you run out of calories.

Here’s the math. Say your dachshund eats 300 calories a day, and use your food bag’s chart or your vet’s figure for your own dog. Ten percent is 30 calories. By the USDA numbers, that’s about 176 grams of raw zucchini, or roughly 18 slices.

No small dog should eat that much of a new vegetable at once, since a sudden pile of anything unfamiliar can loosen stools.

Chewy’s portion chart suggests two to three bite-size pieces, two or three times a week, for dogs of 11 to 20 pounds, which is a sensible ceiling for most dachshunds.

Can your dog eat zucchini every day? A slice or two of plain zucchini each day is unlikely to hurt a healthy dog. Watch the next day’s poop the first few times, and cut back if it turns soft.

Zucchini bread, zoodles and other zucchini dishes

Zucchini bread isn’t a good treat for dogs, because of the sugar, butter and add-ins baked into it. The AKC warns that baked goods add fat and calories, and some sugar-free recipes use xylitol, a sweetener the FDA warns can poison dogs.

Read the recipe before you share a crumb. Plenty of zucchini breads have raisins, and raisins are one of the foods covered in can dogs eat grapes. Chocolate zucchini bread brings chocolate into it too, which is a firm no.

Zoodles in sauce, zucchini fries and grilled zucchini off your own plate are no better. Most of them carry garlic or onion, both harmful to dogs, so keep a few plain pieces back while you cook if you want to share.

Can dogs eat squash, or the zucchini plant?

Yes, most squash is fine for dogs when it’s cooked or raw, plain and in small pieces. Yellow summer squash is the same species as zucchini and is handled the same way.

Winter squash such as butternut is hard when raw, so cook it first and leave out the tough rind and big seeds.

The bitter-taste warning applies to every squash. Ornamental gourds are grown for looks, and they shouldn’t become a chew toy.

The plant itself is less of a worry. The AKC says zucchini leaves and flowers aren’t toxic to dogs. Some dachshunds don’t wait to be offered, as one owner remembered about a dog they’d lost:

“Our second dachshund, who is no longer with us, used to love the zucchinis so much she would sneak into our garden and also steal the stalks and leaves.”
– r/Dachshund, November 2024

If your dog raids the vegetable bed, think about what else is growing there, and about what’s been sprayed on it. Weed killers that are safer around pets explains which products to keep away from a dog that grazes.

Tomorrow morning, I’d slice a zucchini, taste the cut end and drop two thin pieces into the bowl. The amount is hard to get wrong, so the taste is where your attention belongs.