How 5 kg of puppy changes the math
At this weight, your pup is big enough that a single green leaf might not cause severe poisoning, but small enough that two or three leaves could be dangerous. Puppies also tend to chew thoroughly, releasing more toxins than an adult dog who gulps plant material. The real risk comes from repeated exposure if the plant remains accessible.
Solanine absorption varies by breed — terriers and herding dogs often show symptoms at lower doses than retrievers. Watch for unusual scratching at the mouth within the first hour, which many owners mistake for allergies rather than early toxin irritation.
When diarrhea means more than an upset stomach
Puppy digestive systems react faster than adults', sometimes within 30 minutes of ingestion. What looks like typical 'dietary indiscretion' diarrhea becomes concerning if you see mucus or dark green flecks in it. Tomato plant material often causes a distinct smell — sharper and more bitter than standard puppy diarrhea odor.
Hydration is key: press your finger gently on his gums. If the white fingerprint mark takes more than 2 seconds to pink up, he's already dehydrating faster than an adult would. Don't rely on water bowl visits — sick puppies often lap at water without actually swallowing much.
The wobbliness test owners miss
Neurological symptoms in puppies manifest differently than in kittens. Instead of obvious tremors, try this: call him from across the room when he's not expecting it. A healthy puppy will spring up immediately; one affected by solanine may rise in stages — front paws first, then a slight pause before the hindquarters follow.
Check his paw grip on smooth floors. Toxins often cause subtle weakness where he'll stand normally but slide slightly when turning. His 'puppy clumsiness' will seem more pronounced on turns to one particular side if the toxin is affecting muscle coordination asymmetrically.
Why fencing isn't always enough
Puppies dig and squeeze through gaps adults can't. The entire plant — including fallen leaves and trimmings — needs removal. Tomato plant toxicity doesn't decrease significantly when dried, so even dead-looking vines pose a risk. Watch for raised garden beds he could climb onto using nearby objects as steps.
Consider his recent chewing history — if he's teething heavily, the cool, firm texture of tomato stems may attract him more than other plants. Redirect with frozen carrot sticks or rubber toys kept in the refrigerator for similar mouth-feel without the risk.
The step-by-step response, from the first minute to the vet visit, is in our Tomato & Potato Plants (Solanine) emergency guide.