Why a 40 lb dog might not show immediate signs
Your dog's size buys some time—solanine toxicity often hits smaller animals faster. Right now, the alkaloids are being absorbed from the gut into the bloodstream. At two hours post-ingestion, you're in the window where early gastrointestinal signs like lip-smacking or excessive licking might appear before full vomiting starts. The plant's maturity and which parts were eaten (stems are worse than leaves) affect how quickly trouble brews.
Watch for subtle changes: a normally food-motivated dog turning away from treats, or restless pacing that suggests abdominal discomfort. Bigger dogs sometimes mask early symptoms better than small breeds, so don't assume no signs means no risk. The next six hours are when most solanine-related nausea becomes obvious in canines of this weight class.
The danger zone between 4-12 hours post-ingestion
Solanine's neurological effects tend to appear later than stomach upset. Between dinner time and bedtime tonight, check your dog's pupils in dim light—uneven or dramatically dilated pupils signal the toxin is affecting the nervous system. Wobbly hind legs when turning sharply or trouble jumping onto furniture are red flags worth an emergency vet call.
Hydration matters now. If vomiting starts, offer ice chips rather than bowls of water to prevent over-drinking that could trigger more vomiting. The combination of solanine's effects on both the gut and nervous system means symptoms can snowball after the first vomit, especially in active dogs that don't rest.
What overnight monitoring should involve
Set a phone alarm for every two hours tonight to check three things: breathing rate (count the rises of their flank for 15 seconds, multiply by 4), ability to wake fully, and gum color (press briefly—white or blue means go straight to emergency care). Dogs metabolize solanine slower than humans, so midnight is not a safety milestone.
Keep a flashlight handy to check for tremors—these often start as fine muscle twitches around the whiskers or shoulders before becoming body-wide. A dog that sleeps soundly but won't stand steadily when aroused needs veterinary intervention before morning. The 18-hour mark is when we typically see peak solanine concentrations in the bloodstream.
When to stop worrying about delayed reactions
If 24 hours pass with only mild drooling or one vomiting episode, the worst is likely over—but don't relax completely yet. Some dogs show delayed diarrhea from gut irritation 36-48 hours later. Offer bland food (boiled chicken and rice) for the next two days to help the digestive tract recover.
Permanent damage is rare from single small exposures in medium-sized dogs, but watch for lingering sensitivity to sunlight (solanine can make skin more photosensitive) or picky eating that lasts more than three days. These warrant a non-emergency vet visit to check for secondary gastritis.
The step-by-step response, from the first minute to the vet visit, is in our Tomato & Potato Plants (Solanine) emergency guide.