Why diarrhea can signal a partial blockage in a 25 kg dog
When a dog eats corn cob, the real danger isn’t toxicity—it’s mechanical. That 3-inch piece is large enough to scrape the digestive tract or get stuck, especially in a medium-sized dog like yours. Diarrhea often occurs because the intestines try to flush the obstruction, letting only liquids pass. The tender belly suggests irritation or early inflammation, which means this isn’t just routine upset.
Watch for straining to defecate, vomiting, or sudden lethargy. These signs, combined with the belly tenderness, mean the cob might be wedged somewhere between the stomach and colon. Even if your dog is still passing stool, partial blockages can worsen over 12–24 hours as swelling increases.
How a corn cob differs from other swallowed objects
Unlike soft items that might pass with monitoring, corn cobs are dense, fibrous, and often break into sharp chunks. Their ridges can anchor them in place, making it hard for the intestines to push them through. For a dog your size, a 3-inch piece is right on the borderline of what might pass naturally—but the symptoms you’re seeing tilt the odds toward trouble.
The cob’s dryness also matters. As it sits in the gut, it absorbs moisture and swells, increasing the risk of a full blockage. This is why some dogs seem fine at first but decline hours later. Your dog’s weight buys some time, but not immunity from complications.
What to check in the next 6 hours
Press gently along your dog’s left side (behind the ribs) and lower abdomen. A normal gut feels soft and mobile; a firm or painful spot could mark the cob’s location. Note whether your dog reacts more when standing versus lying down—discomfort that worsens with movement often points to intestinal involvement.
Offer small sips of water, but skip food for now. Eating could increase pressure behind a blockage. If the diarrhea stops abruptly or your dog starts dry heaving, treat it as an emergency—these are classic signs of a complete obstruction. Even if symptoms seem stable, a vet visit today is wise given the belly tenderness.
Why X-rays may not tell the whole story
Corn cobs are tricky to spot on X-rays because their density resembles normal gut content. Your vet might need contrast imaging or ultrasound to confirm a blockage. Don’t wait for "perfect" proof if symptoms persist—dogs often need surgery based on clinical signs alone.
Recovery depends on where the cob is lodged. Stomach blockages sometimes allow for endoscopic removal, but intestinal obstructions usually require surgery. The sooner it’s addressed, the lower the risk of tissue necrosis or sepsis. With prompt care, most dogs recover fully, but delays can turn a simple procedure into a life-threatening crisis.
The step-by-step response, from the first minute to the vet visit, is in our Corn Cob Hazards for Dogs and Cats emergency guide.