Kale and dogs: with caution
Caution
CAUTION: small amounts of washed, plain kale are generally fine for healthy dogs as an occasional treat, but kale contains calcium oxalate (kidney/bladder stone risk) and isothiocyanates (GI irritation), and regular feed
Depends on the form, the amount or the dog.
CAUTION: small amounts of washed, plain kale are generally fine for healthy dogs as an occasional treat, but kale contains calcium oxalate (kidney/bladder stone risk) and isothiocyanates (GI irritation), and regular feeding can affect thyroid function, especially in hypothyroid dogs. Avoid it for dogs with kidney, bladder, or thyroid conditions.
- Safe form
- Plain, thoroughly washed kale leaves (to remove pesticide residue), stems removed, chopped small, fed raw or lightly steamed/blanched, in small amounts as an occasional treat or food topper for an otherwise healthy adult dog — never as a diet substitute.
- Unsafe form or part
- Kale is a single ingredient, so risk is driven by quantity, frequency, and the dog's health status rather than a specific "unsafe part": large amounts, regular/daily feeding (thyroid interference risk), and any feeding at all to dogs with existing kidney or bladder stone history, kidney disease, GI sensitivity, or hypothyroidism (medication interaction risk per AKC).
- Preparation
- Wash thoroughly to remove pesticide residue; remove tough stems; chop into small pieces; serve raw or steam/blanch to ease digestion; keep portions small and occasional (treat-level, not a meal component); do not feed regularly to any dog, and do not feed at all to dogs with kidney/bladder stone history or hypothyroidism without vet clearance.
- Do not offer
- Kale is a single ingredient, so risk is driven by quantity, frequency, and the dog's health status rather than a specific "unsafe part": large amounts, regular/daily feeding (thyroid interference risk), and any feeding at all to dogs with existing kidney or bladder stone history, kidney disease, GI sensitivity, or hypothyroidism (medication interaction risk per AKC).
- Deliberate feeding
- Only once the form and amount are clear
- Hazard level
- 2 of 4
If your dog has already eaten kale
Kale ingestion is not an emergency. If a dog eats a larger amount than intended, monitor for vomiting, diarrhea, straining to urinate, or other changes in urination habits (possible early stone-related signs), and contact your veterinarian if any of those appear or if the dog has a history of kidney/bladder stones.
Sources: American Kennel Club, PetMD. Evidence grade B. Last verified 2026-09-07. Dataset 2026.09.
Which form of kale the sources actually cleared
Plain, thoroughly washed kale leaves (to remove pesticide residue), stems removed, chopped small, fed raw or lightly steamed/blanched, in small amounts as an occasional treat or food topper for an otherwise healthy adult dog — never as a diet substitute.
Preparing kale for a dog
Wash thoroughly to remove pesticide residue; remove tough stems; chop into small pieces; serve raw or steam/blanch to ease digestion; keep portions small and occasional (treat-level, not a meal component); do not feed regularly to any dog, and do not feed at all to dogs with kidney/bladder stone history or hypothyroidism without vet clearance.
What actually goes wrong
- Two dog-specific vet/expert sources (AKC, PetMD) agree kale is not acutely toxic but is commonly problematic in three ways: (1) calcium oxalate content, which can contribute to kidney or bladder stones, especially in dogs with a history of them; (2) isothiocyanates and high fiber, which can cause mild-to-severe gastric irritation, upset stomach, or diarrhea; (3) goitrogenic/thyroid-interfering compounds if kale is fed regularly, a concern the general veterinary literature (Merck Veterinary Manual, in a livestock/goiter context, not dog-specific) also confirms for the Brassica family generally ("Cabbage, rape, kale, and turnips are also goitrogenic"). AKC frames kale more cautiously ("Kale can cause medical problems for dogs," "some veterinarians caution against it") than PetMD, which leads with "kale is OK for dogs to eat" as an occasional treat; per the more-cautious-wins rule, this entry is graded CAUTION rather than plain SAFE_MODERATION. No source found describes kale as an emergency toxin for dogs.
Two dog-specific vet/expert sources (AKC, PetMD) agree kale is not acutely toxic but is commonly problematic in three ways: (1) calcium oxalate content, which can contribute to kidney or bladder stones, especially in dogs with a history of them; (2) isothiocyanates and high fiber, which can cause mild-to-severe gastric irritation, upset stomach, or diarrhea; (3) goitrogenic/thyroid-interfering compounds if kale is fed regularly, a concern the general veterinary literature (Merck Veterinary Manual, in a livestock/goiter context, not dog-specific) also confirms for the Brassica family generally ("Cabbage, rape, kale, and turnips are also goitrogenic"). AKC frames kale more cautiously ("Kale can cause medical problems for dogs," "some veterinarians caution against it") than PetMD, which leads with "kale is OK for dogs to eat" as an occasional treat; per the more-cautious-wins rule, this entry is graded CAUTION rather than plain SAFE_MODERATION. No source found describes kale as an emergency toxin for dogs.
How much counts as too much
All treats combined should generally stay within 10% of daily calories for a healthy adult dog in ideal body condition; individual needs vary.
The table below is the WSAVA reference allowance, printed as published. It is not a portion of kale: it is the total treat-calorie ceiling that everything given outside meals has to fit inside. Average healthy adult dog in ideal body condition. A veterinary team should set the individual dog's daily energy requirement.
| Body weight (kg) | Body weight (lb) | Max treat kcal/day |
|---|---|---|
| 2 | 4.4 | 14 |
| 4 | 8.8 | 24 |
| 6 | 13.2 | 32 |
| 8 | 17.6 | 40 |
| 10 | 22 | 47 |
| 15 | 33.1 | 64 |
| 20 | 44.1 | 79 |
| 25 | 55.1 | 94 |
| 30 | 66.1 | 108 |
| 35 | 77.2 | 121 |
| 40 | 88.2 | 134 |
| 45 | 99.2 | 146 |
Source: WSAVA Global Nutrition Committee, Feeding Treats to Your Dog. Retrieved 2026-09-07. Working out how many calories your dog needs in total is a separate question — the dog food calculator handles that side.
What these sources do not settle
Both cited URLs load and are the correct pages. AKC's page contains the exact quoted sentence on thyroid interference verbatim, and independently corroborates the calcium-oxalate/stone and isothiocyanate/GI-irritation risks; its own summary hedges toward caution for dogs with underlying conditions. PetMD's page contains the exact quoted sentence on calcium oxalate/kidney-bladder stones verbatim, immediately following an explicit instruction not to share kale with dogs who have kidney or bladder
Sources and review
- American Kennel Club — American Kennel Club — "Can Dogs Eat Kale?" (lists okra under high-calcium-oxalate foods) (grade B, retrieved 2026-09-07)
- PetMD — PetMD — Can Dogs Eat Kale? (grade B, retrieved 2026-09-07)
Verdict last verified 2026-09-07. How this site handles sourcing and corrections is set out in the editorial policy, and every reference the site relies on is listed on the sources page.
This page is reference material, not veterinary advice. A dog with a medical condition, a prescription diet or a suspected ingestion needs a veterinarian or a poison control centre, not a web page.
We research and check what we publish, but we do not warrant that any figure, date, price, or statement is accurate, complete, or current, and we accept no liability for any loss, cost, injury, or other harm arising from the use of this site. Use it as one reference among several. You remain responsible for your own decisions and for your dog's care - confirm anything that matters with a licensed veterinarian or another qualified professional before you act on it. Full disclaimer.