Why multiple sprouts change the risk calculation
Each green sprout packs concentrated solanine—think of them as toxin storage units the plant uses to protect new growth. For a 20 kg dog, even five or six sprouts may deliver a problematic dose. The first signs will likely be oral: foamy drool sticking to the fur around the mouth, or exaggerated swallowing motions as throat irritation begins.
Unlike some toxins that cause immediate vomiting, solanine often triggers nausea first. Your dog might lick floors obsessively, eat grass frantically, or show unusual lip-curling. These behaviors usually precede actual vomiting by 30-90 minutes in cases like yours. Time these symptoms—faster onset suggests heavier exposure.
The progression from gut to nervous system symptoms
Initial vomiting may provide false reassurance if the solanine has already started absorbing. Watch for diarrhea with a distinctive greenish tint—this suggests the sprouts are moving through while still releasing toxins. More concerning is diarrhea with mucus or blood, which indicates deeper intestinal damage.
Neurological signs emerge differently in every dog. Some develop a 'drunk walk' with wide leg stance first; others show eye changes—either rapid side-to-side movements (nystagmus) or fixed, unresponsive pupils. These typically appear 3-5 hours post-ingestion with significant sprout consumption. Have your phone charged and car keys ready when these signs appear.
How body weight affects toxin processing
At 20 kg, your dog isn't in the highest risk weight category, but don't underestimate sprout toxicity. The solanine dose per kg of body weight matters more than total amount eaten. Smaller dogs within this weight range (like terriers) often show stronger reactions than lanky breeds of the same weight due to metabolic differences.
Muscle tremors starting in the hindquarters are an urgent sign—the back legs often go first because solanine affects longer nerves earlier. If your dog sits down abruptly or drags a back paw when walking, the toxin is disrupting nerve signals. This typically happens 6-8 hours after eating sprouts in dogs of this size.
Critical hours 8-12 after ingestion
This is when solanine's cardiac effects may surface in severe cases. Feel your dog's chest—a racing pulse (over 120 bpm at rest) or irregular rhythm warrants immediate veterinary attention. Cool extremities (paws feeling unusually cold) paired with rapid breathing suggest dropping blood pressure.
Most dogs that make it 12 hours without progressing beyond gastrointestinal signs will recover, but may need supportive care. Offer electrolyte-enhanced water in small amounts if there's been vomiting, but never force hydration. The sprouts' roughage can cause residual gut irritation for several days—expect looser stools than normal.
The step-by-step response, from the first minute to the vet visit, is in our Tomato & Potato Plants (Solanine) emergency guide.