Why 6 kg makes every bite count
A Chihuahua’s tiny body has no room for error with rhubarb leaves. The oxalates in just one or two leaves can bind calcium in their bloodstream, causing tremors or weakness within hours. At 6 kg, their kidneys are also working with far less margin to filter out the crystals before damage starts. What might be a mild stomach upset for a bigger dog becomes a metabolic emergency at this size.
Watch for drooling, pawing at the mouth, or sudden lethargy — these are signs the oxalates are taking effect. Even if your Chihuahua seems fine now, the risk isn’t just about immediate symptoms. The crystals can accumulate in their urinary system over the next 12–24 hours, potentially causing blockages. Don’t wait for visible distress; their small size means early vet intervention is critical.
The 35 kg buffer — not a free pass
While your Golden’s larger body mass dilutes the immediate impact, rhubarb leaves are still poisonous at any dose. They may not show acute signs like vomiting right away, but oxalates silently strain the kidneys over time. A big dog might tolerate a leaf or two better in the moment, but repeated exposure could lead to chronic issues like kidney stones.
Their size buys you slightly more time, but not safety. If they ate more than a couple of leaves, or if you’ve caught them sneaking rhubarb before, the cumulative damage becomes a concern. Big dogs often hide discomfort until problems are advanced, so assume they need a vet check too — just with less panic than the Chihuahua’s situation.
When size changes the timeline
For your 6 kg dog, the first two hours matter most. Small bodies process toxins faster, so symptoms like drooling or restlessness can appear within 30 minutes. The vet may need to act quickly to protect their kidneys and stabilize calcium levels. With a 35 kg dog, signs might take 6–12 hours to emerge, but delaying care risks long-term organ stress.
Both dogs should go to the vet, but prioritize the Chihuahua. Their treatment might include IV fluids to flush crystals and calcium supplements, while the Golden may only need monitoring unless they ate a large amount. Never assume the big dog is ‘fine’ just because they’re not showing distress yet — oxalate poisoning works silently in large breeds.
Why you can’t compare their reactions
Expect entirely different symptoms between these two dogs. The Chihuahua might collapse from low blood calcium, while the Golden could just seem slightly off their food. Smaller dogs often show neurological signs (twitching, seizures) first, while larger ones exhibit vague lethargy or increased thirst days later.
This isn’t a ‘wait and see’ scenario for either pet. The Chihuahua needs urgent care to prevent acute crisis, and the Golden requires bloodwork to catch kidney changes early. Their size difference doesn’t change the poison — it just changes how fast and visibly it attacks their systems.
The step-by-step response, from the first minute to the vet visit, is in our Rhubarb Leaves Poisoning in Dogs and Cats emergency guide.