Why
Cucumbers have almost no carbs or fat and add water and several vitamins, which makes them one of the lightest snacks you can give.
How to serve cucumbers
- Slice into rounds or sticks; frozen slices work well.
Watch out for
- Cut to size for small dogs.
- Pickles are not the same: skip them because of salt and spices.
How much cucumbers can a dog eat?
Treats of every kind should stay under 10% of a dog's daily calories, says the World Small Animal Veterinary Association. Here is that daily treat budget by size, and how much cucumbers it buys if cucumbers is the only treat that day. Cucumbers has about 15 kcal per 100 g; 0.5 cup slices (52 g) is about 8 kcal.
| Dog size | Daily treat budget | Max cucumbers a day |
|---|---|---|
| Small (10 lb) | 26 kcal | 174 g (about 3 0.5 cup slices) |
| Medium (30 lb) | 59 kcal | 395 g (about 8 0.5 cup slices) |
| Large (60 lb) | 100 kcal | 668 g (about 13 0.5 cup slices) |
| Giant (90 lb) | 136 kcal | 907 g (about 17 0.5 cup slices) |
Less is better for small, overweight or diabetic dogs. Work out your own dog's numbers with the dog food calculator. Calories: USDA FoodData Central, Cucumber, with peel, raw.
Other vegetables: quick answers
| Food | Verdict | Short answer |
|---|---|---|
| Asparagus | Avoid | Not unsafe, but not worth it. Asparagus is tough raw and loses most of its value when cooked soft. |
| Mushrooms | Avoid | Store-bought mushrooms are generally fine, but wild mushrooms can be deadly. |
| Tomatoes | Avoid | Best avoided. Ripe flesh is generally safe, but the green parts of the plant contain a toxin. |
| Broccoli | Small amounts | Yes, in small amounts. Cooked florets are easiest on the stomach. |
| Brussels sprouts | Small amounts | Yes, a few cooked sprouts. Expect gas. |
| Corn | Small amounts | Yes, off the cob. The cob can cause a dangerous blockage. |
| Peas | Small amounts | Yes, plain green peas in moderation. |
| Potatoes | Small amounts | Yes, plain and fully cooked, as an occasional extra. Never green or raw. |
Rules for any new food
- Plain is the rule: no salt, butter, oil, onion, garlic, sugar or sweeteners. Most of the danger in human food comes from what is added to it.
- Keep all treats under 10% of your dog's daily calories (WSAVA). The rest should come from a complete dog food.
- Check labels for xylitol, raisins, chocolate and macadamia nuts, which turn up in baked goods, snacks and spreads.
- If your dog has a health condition, such as diabetes, pancreatitis or kidney disease, ask your vet before adding any new food.
Frequently asked questions
Are cucumbers safe for dogs?
Yes. Cucumbers are almost calorie-free and great for overweight dogs.
How much cucumbers can a dog eat?
Treats of any kind should stay under 10% of a dog's daily calories (WSAVA). For a 30 lb dog that is about 59 kcal a day, or roughly 395 g of cucumbers if it is the only treat that day.
Sources
- American Kennel Club, "Fruits and Vegetables Dogs Can and Can't Eat" (updated Aug 4, 2026)
- WSAVA Global Nutrition Committee, "Feeding treats to your dog"
- USDA FoodData Central, SR Legacy (April 2018 release)
Checked October 17, 2026. We are a reference, not a vet: if in doubt, call yours. How we check.