Why an 8 kg dog can handle one whole leaf
Your terrier's body weight means this single kale leaf is more of a snack than a threat. While raw kale contains oxalates that can bind calcium in large quantities, the amount in one leaf spread across 8 kg of dog is like a human eating half a grape. The leaf's texture might briefly irritate the throat or stomach lining, but the physical size won't cause obstruction in a terrier-sized digestive tract.
Dogs process plant matter less efficiently than meat, so you may notice the leaf reappears nearly intact in tomorrow's stool. This is normal—their stomach acid isn't optimized for breaking down tough greens. The fiber could slightly speed up bowel movements, leading to one loose stool within 24 hours without indicating true distress.
When raw differs from cooked for small dogs
Raw kale's rigid cellulose structure makes it harder to digest than steamed leaves, which is why some dogs get gassy after eating it. Your pup might produce a couple of unusually smelly farts in the next 8 hours as gut bacteria work on the unfamiliar fiber. This doesn't mean poisoning—it's just microbial fermentation of plant material their system rarely encounters.
Unlike cooked kale that softens cell walls, raw leaves retain compounds called isothiocyanates that can mildly irritate the stomach lining. Watch for one-off signs like lip-licking or swallowing motions, which indicate temporary nausea rather than toxicity. These should pass within 3-4 hours as the leaf moves into the intestines.
The next 12 hours: what doesn't require panic
A single episode of vomiting within the first 6 hours wouldn't be alarming—it's the stomach's way of rejecting roughage. The vomit may contain leaf fragments or yellow bile. As long as your dog acts normally afterward (interested in treats, no continued heaving), you can assume it was a mechanical reaction rather than poisoning.
If stools are slightly softer tomorrow morning but still formed, that's the fiber doing its job. Only worry if diarrhea is completely liquid or contains blood. A healthy 8 kg dog can lose up to two tablespoons of water this way without dehydration risk—about the amount that would slightly darken the stool color.
Why you don't need to induce vomiting
Oxalate toxicity requires eating roughly 1.5 cups of raw kale per 5 kg daily for weeks. Your dog's dose is about 1/100th of that threshold. Forcing vomiting could do more harm by exposing the esophagus to stomach acid unnecessarily, especially since kale leaves aren't sharp enough to warrant removal.
Instead of interfering, offer a bland carb like plain boiled rice with the next meal to help move the leaf through. The rice acts like a cushion while providing easy energy. Skip high-fat foods for 24 hours since fat digestion requires bile that might be slightly disrupted by the oxalates.
The full verdict, portion guidance and serving notes are collected on the Kale food facts page.