Why fresh leaves hit small dogs harder
Fresh hop leaves release their compounds more readily than dried ones, and your 4 kg Pomeranian's tiny body weight means even a few chewed leaves can deliver a dangerous dose. The bitter taste often stops dogs from eating much, but with overnight access, repeated nibbling could have added up. Look for leaves with clear teeth marks to gauge how much was actually swallowed versus just torn.
Malignant hyperthermia doesn't wait for obvious symptoms—by the time you see panting or restlessness, internal temperatures may already be climbing dangerously. Small breeds show distress sooner than larger dogs because their metabolism works faster relative to their size. If those leaves were young and green, they likely held higher concentrations of the problematic resins.
The overnight delay complicates things
Since you found this in the morning, we don't know exactly when during the night your dog chewed the hops. The first six hours are most critical for symptom onset, but delayed reactions can still occur. Check your Pomeranian's gums—if they're bright red instead of pink, or feel hotter than usual against your hand, the process may already have started.
Dogs often hide discomfort until they can't anymore, so don't assume no visible signs means safety. Take their rectal temperature if possible—anything above 39°C (102°F) in this context warrants immediate action. The combination of small size and unknown ingestion time means this isn't a wait-and-see situation.
What to do right now for 4 kg of risk
With a dog this small, there's no safe home monitoring period—even if they seem fine now. Wrap them in a cool (not cold) damp towel during transport to help counteract any early temperature spikes, but avoid ice or very cold water as that can shock their system. Keep the car well-ventilated and watch for any sudden behavior changes like whining or stumbling.
Bring a sample of the chewed leaves with you so the vet can assess the variety—some hops cultivars contain higher toxin levels. Expect bloodwork to check organ stress and intravenous fluids to protect the kidneys. Small dogs dehydrate faster during hyperthermia, so early intervention greatly improves outcomes.
Why this differs from larger dogs' experiences
A 30 kg dog might pass a few hop leaves with minor stomach upset, but your Pomeranian's dose per kilogram is exponentially higher. Their petite frame also means their body can't distribute or metabolize the toxins as effectively—think of it like dropping the same amount of dye into a shot glass versus a bucket of water.
The trembling mentioned in the short answer often appears more pronounced in tiny breeds because their nervous systems are closer to the surface, so to speak. What might be mild muscle twitches in a Labrador could look like full-body tremors in a 4 kg dog. Never compare your small dog's reaction to online stories about bigger breeds—the stakes are completely different.
The full verdict, portion guidance and serving notes are collected on the Hops (used hops) food facts page.